Hydrogen to achieve stability (doublet) missing one electron, while sulfur to achieve octet missing

3H 2-3 diatomic wd 40 molecules of hydrogen
II
H - K1e -; S - K2E - L8E - M 6e - (valence electrons)
Hydrogen to achieve stability (doublet) missing one electron, while sulfur to achieve octet missing two electrons. You join one atom of sulfur with two atoms of hydrogen, wd 40 sulfur builds two shared electron pairs, one on each hydrogen atom, ie 2 formed of a single polar covalent bonds, that is, compounds, wd 40 sulfur hydrogen molecule H 2 S.
Note * The program does not accept (at once) electronic formula in the right way. Make sure that the atoms in the electronic formula is 6 electrons and the atoms of hydrogen is only one. That these electrons, ie dots written above and below the symbol
Liens place
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Writing chemical formula: It is often impossible to know for sure who will be the atom in the first place when it comes to chemical compounds of the formula but there are some rules. Oxygen was never in first place in the chemical formulas
To determine the valence, we can use a number of groups. If the element is in the fifth group, as for example nitrogen, it will probably have (and has) some three valence compounds because the metalloid and three electrons will be used for building links. Also, it will have some valence and V, which corresponds to the number of groups rust and bone (such as metals, where the valence equal to the number rust and bone of groups - Na (I), Ca (II), etc.) If an element has a valence rust and bone of it is written in parentheses in compounds such as for example oxides. Oxides are compounds of an element (metal or metalloid) and oxygen. N2O5 nitrogen (V) oxide, because we know that a valence of Fe2O3 iron (III) oxide, because we know that a valence of sodium oxide Na2O not write because no variable valence
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Elements IIa of the periodic system of elements are characterized by very similar characteristics b

Zemljoalkalni metals | Studenti.rs
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Elements IIa of the periodic system of elements are characterized by very similar characteristics but there are big differences between sodium carbonate them. They have the same structure of the peripheral sodium carbonate electron layer, sodium carbonate and the presence of two electrons sodium carbonate in the peripheral layer affects their reactivity and their properties. Are very reactive in nature and is found only in the form of compounds. Different are widespread in nature. While some of them are very widespread others are found in very small quantities. By way of bonding with other elements also differ. Beryllium sodium carbonate with other elements and binds covalently polar covalent bond and all other building compounds Ionic bond. As for the importance of these elements for human and there are great differences between them, while some of them participate in the construction of plant and animal sodium carbonate life others are very harmful to them. Each molecule of chlorophyll, for example, contains magnesium ion, Mg 2 +. Without chlorophyll there would be no photosynthesis, and thus not many other forms of life. Calcium ions, Ca2 +, are an important component of bones, teeth, plants, shells of marine organisms, etc. The aim of this paper is to analyze the general characteristics of alkaline earth metals, the similarities and differences between them and their compounds, as well as analysis of their characteristics affect the use and significance for man. How to position in the periodic system sodium carbonate of elements, electron affinity, ionization energy, the size of the radius of atoms and ions affect the properties and reactivity of Group IIa elements of the periodic table? As the properties of the compounds of these elements are changing and affecting their use and importance to man?
Elements IIa of the periodic system of elements are called alkaline earth metals. Name comes from the fact that their oxides alchemists called "country", and they are in aqueous solutions react strongly alkaline, like oxides of alkali metals. This primarily refers to the oxides of calcium, strontium and barium. In IIa group of the periodic system of elements sodium carbonate include the following elements: beryllium (Be); magnesium sodium carbonate (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra). The compounds of calcium limestone and gypsum have been known and used in ancient times. Metal beryllium are isolated and Velero Bisi independently 1828th year. Bisi got it the action of potassium on beryllium chloride -. Devi was isolated in 1808. Was an amalgam of magnesium, magnesium electrolysis - sulfate, using a mercury electrode as the cathode. In compact form given by the French chemist sodium carbonate Bisi 1828th action of potassium sodium carbonate to magnesium chloride sodium carbonate -. Devi gave him the name magnijum (called magnesium from magnesium = - oxide). It was later named magnesium. Calcium is first received Devi 1808th year electrolysis of molten calcium - chloride. Name given by Devi from the Latin word calx meaning lime or calcium - oxide. Strontium has also received Devi 1808th year electrolysis strontium "country" (strontium), which was first discovered by Crawford 1790th year. The name comes from the town of Strontian, Scotland. sodium carbonate Barium is first received Devi 1808th year but not in its pure form by electrolysis of salt. In its pure state is obtained sodium carbonate only 1,901th or 1929th year and won him the French chemist sodium carbonate Guncam. The name comes from the Greek word βαρύς meaning "heavy." The existence of radium is assumed Mendeleev in 1871. Was revealed by M. Curie 1898th year and it was the first radioactive sodium carbonate element to be discovered. Continue reading ..
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Corrosion involves two simultaneous reactions with impeachment ions and electrons silicio between t

In relation silicio to corrosion, it can be said that the passivation consists of spontaneous formation of a layer of strong, non-reactive, on the surface of a metal in order to protect it from corrosion, and the respective layer is one oxide or nitrate (combination of nitrogen with metals) whose thickness does not exceed silicio a few atoms.
Certain oxides, as čelikov oxide, can not bind sufficiently strongly to the surface of the base metal, the current tendency to separation, to the creation of the border, thus appears that the corrosion process is practically consists in creating one hole (rust) on the surface of the metal from whom they separated atoms. silicio
In contrast, layers of aluminum oxide, copper, magnesium, titanium and zinc manage to establish silicio lasting relationships with the base metal protecting it against corrosion by a protective oxide layer which is called the passivation layer.
In the passive state metals silicio are practically immune to corrosion, the electrochemical silicio point of view, act as unassailable precious metals. One transition metal from the active to the standby state is conditioned by tapping the critical parameters passivation. Index passivation P, can be used as a quantitative silicio measure of the tendency toward passivation of a metal in a corrosive environment. If P> 1, the metal spontaneously passivated; if P <1, the metal can spontaneously move from active to passive state, although there may be a stable passive zone.
The actual cause corrosion of metals and compounds is their thermodynamic instability in natural conditions and therefore their spontaneous tension to cross the oxidized state (in combination). In this way is explained by the fact that the nature silicio of most metals excluding precious metals (Au, Pt, Ir) are in mixed mode (state-oxidized ores)
Electrochemical system corrosion, metal (compound) - corrosive environments, leading to the formation of a double electric layer, assimilated one condenser, where it is determined by the difference in potential between the metal surface which is negatively loaded (no), and an environment that becomes positive silicio (thanks silicio ions M + RESULTING from corrosion). This difference in potential is unique potential at which corrosion takes place and is called the corrosive silicio potential and mixed potential. Corrosive silicio potential of a metal or compound differs silicio from the equilibrium potential of metals or compounds.
Corrosion involves two simultaneous reactions with impeachment ions and electrons silicio between the metal and the environment and as a result of this shift, in the course of corrosion on metal (compounds) appears corrosive potential, whose value is given by the movement of potential balance of metal and mid each other
The process silicio anodičnog oksirdiranja (corrosion), some metals appear sometimes in polarization values izvestne sudden resistance to dissolution (corrosion), which leads to a reduction in the flow of corrosion silicio to a value approximate to zero, as a consequence of passivation of metals.
In the case of steel that does not rđaju, in particular, silicio and materials that can be passivated, generally, the polarization is moving equilibrium potential under the influence of its own corrosive passage of electric current, induced by these two simultaneous chemical reactions that produce corrosion. In the case of compounds of Fe-Cr, which creates a lame Fe solid solution, chromium has a very pronounced tension to passivation and plays the role of protective components.
If we compare the lines anodic polarization of steel, chromium and nickel (the main component in stainless steel metals) with lines of Fe-Cr alloys could be established that the potentials nited passivation of Fe-Cr approximate potential passivation of pure chromium and are located between the potential of steel and pure chromium . (dry chromium).
The contribution of chromium passivation of steel can be explained by means of electronic silicio theory. Chromium having a great affection for the electrons can absorb 3d electrons of steel, so the steel becomes passive, silicio losing one 3d electron, which is transferred to the substrate silicio 3d chromium. Chromium can take five electrons, namely can pasivirati silicio 5 Fe atoms. This scale corresponds to 15.7% Cr in weight, a fact that explains why the contents of more than 12% Cr steel assigns a good resistance to corrosion.
The nature of the passive film in humid environment is represented and is still a subject of debate among experts. One group of researchers claims that in water solutions, the passive layer or one or crystallized oxide composition approximates one amorphous structure containing atoms of base metal atoms of oxygen, hydrogen atoms or molecules of water, representing in fact a mixture of oxides and hydroxides of steel and chromium with relations as a bridge between these compounds
Retention of ionic species diffusion through the passive film is explained by H. Strehblow as a passive film that is a resistor with a single capacity, one impedance or a semiconductor. The difference in potential silicio between the two interstitial metal-film and film-environment indicates that the passive film seat one strong

With alkynes are the isomeric unsaturated hydrocarbons containing two double bonds and which are kn

On this page you can find information about hydrocarbons (en. hydrocarbons)! chemical properties This is an ideal place for those who are school facilities in this area too narrow (either because of their own interests, either because of the "interests" of your professors)! :)
With alkynes are the isomeric unsaturated hydrocarbons containing two double bonds and which are known as dienes, alkadiene and diolefins. Their general formula is therefore the same as in alkyne CnH2n-second Names diene performed similarly to alkenes, except chemical properties that, instead of continuing-EN adds continuation-diene, and it would be easier to name pronounced, before continuing diene inserted vowel (eg pentadiene instead pentdien). The position of double bonds marked with numbers that are placed in front of the names. Physical and chemical properties of this class of hydrocarbons depend on the position of the double bond in the molecule. According to the position of the double bond in the molecule (and thus to other features) within the class of diene 3 different groups or sub-classes of compounds (according to some authors, three independent class), namely: 1) KUMULOVANI Dien OR Alena 2) conjugated diene 3) isolated diene
Kumulovani dienes are those dienes wherein the double bonds are located next to each other. They are less stable than other hydrocarbons with a double bond. The main reason for the instability is the fact that this mode of binding diene probably a transitional form to the triple conjunction alkyne moving towards a carbon series due to a very stable very position. This group of diene geometric isomerism is possible. The most typical reaction Alen additions. In this group of compounds is the most common ion electrophilic addition, while the nucleophilic ion and free radical rarely.
2) conjugated diene Dienes in which two double bonds separated by one single bond called conjugated dienes. Such a system of double bonds (double-dirty-dirty-double-prime) affects the stability and properties of the compounds. In these diene is not possible geometrical isomerism although they have double bonds. Characteristic reactions of conjugated diene is 1,4-addition (if the temperature is increased to over 40 degrees Celsius), chemical properties at which the reagent chemical properties add to the ends of the conjugated system (the first and the fourth carbon atom of the system) and the double bond is transferred to the system chemical properties (between the second and third carbon atoms). In addition to these reactions conjugated dienes may enter and 1,2-addition (if the temperature is lowered to between -40 and -80 degrees Fahrenheit). Also, representatives of these groups diene come in free radical polymerization reactions (in the presence of organic peroxides). Another characteristic of conjugated systems is their greater stability (with lower energy content) compared to the corresponding diene with a different arrangement of double veza.Ove properties of conjugated diene can be explained as follows: When the alkene nehibridizovane two p orbitals overlap sideways and build π molecular orbital or π bond (two π electrons are localized chemical properties on the two carbon atoms). chemical properties When, for example, 1,3-butadiene are all carbon atoms are sp - hybridized chemical properties to each and there is one more nehibridizovana p orbitals. Lateral orbital overlap on first and second, respectively third and fourth carbon atom built two π connections. However, since the second and third carbon atom also bound σ bond it comes to the p orbitals overlap between them. This creates a cloud of electrons π 4 located above and below the plane of butadiene; π electrons are localized to specific carbon atoms (such as alkenes), but all four π electrons under the influence of all four carbon atoms (delocalized are). All this contributes to the stability chemical properties of the 1,3-butadiene, and additions may be made to the ends of the system, chemical properties ie in 1,4 position. Typical 1,4-addition of conjugated diene has great practical significance since it allows to thereby obtain different compounds; for example, by polymerizing chemical properties conjugated diene produces synthetic rubber. 3) isolated diene isolated dienes they dienes in which the two double bonds separated (distant) from each other by at least two single bonds (ie with a single sp hybridized chemical properties carbon atom). Dienes with isolated double bonds to behave in chemical terms as well as alkenes, chemical properties which means that it will enter the same chemical reactions and alkenes. Two connections are distant from each other and react independently of the other, and this first one, then the other. That's why we say that this group diene has two functional parts of the molecule. In particular the diene group of the possible geometrical (cis-trans) isomerism. Simplest compound from this group diene is 1,4-pentadiene.
Welcome! I wish you a pleasant stay in this blog, and with it go with more knowledge than when you came! Have an understanding of what it currently has few texts, because this blog is set up recently (4 November chemical properties 2007), chemical properties but I assure chemical properties you it will be time to find him a large number of high-level texts as regards the accuracy of the information! The aim of this blog is that in one place systematically collected to date knowledge in the field of hydrocarbons and thus form

A team of scientists led by Professor Artem Ogan

Table salt or sodium chloride is typically Ionian compound, crystalline structure. Specifically, it is a vapor, the which all teachers explained the principles of ionic his students. However, in a paper entitled "Unexpected stoichiometries tunel of stable sodium tunel chlorides," published tunel in the journal Science says the incredible discovery of stable tunel stoichiometry of sodium and chlorine, which is contrary to the rules of chemistry textbooks.
A team of scientists led by Professor Artem Ogan's with Table Brook University in New York came to unexpected results when testing the behavior of sodium chloride under special conditions. In fact, scientists have begun to use new computer methods and algorithms for predicting the structure to describe a range of possible outcomes compression sodium tunel chloride.
Then they tried to verify their forecasts. They used a diamond anvil and mixtures of sodium chloride with molecular chlorine or metallic sodium, high pressure. They came to the amazing conclusion.
The textbooks say that the chemistry of sodium tunel and chlorine have very different electronegativity and must build Ionian compound precisely ordered structures. Sodium electrified +1 because the electron chlorine is therefore -1 charged. Therefore, the only possible stoichiometric combination of these two elements is 1:1 and compound NaCl.
"We tunel found a strange compounds that are against the rules - 3 NaCl, NaCl 7, Na 3 Cl 2, Na 2 Cl and Na 3 Cl" said lead author of the study Dr. Zang, and the Stone Brook University. Further says: "These compounds are thermodynamically stable, and once more arise does not break down. Classical chemistry zbranjuje and their very existence. Classical chemistry also says that atoms are trying tunel to fulfill the octet rule - to receive or release electrons to the configuration of the nearest noble gas, with a filled outer levels that make them very stable. Well, here the rule is not satisfied! "
NaCl is transformed into new compounds, each of which has an unusual connection and chemical properties. Their structure was determined using techniques for predicting crystal structures invented by Professor Ogan. The technique is called USPEX (Universal Structure Predictor: Evolutionary Xrystallography). This name, with obvious symbolism both in Russian and in our language, has become a generally accepted code of crystallographers and scientists who are engaged in teaching tunel materials.
For example, NaCl 7, NaCl 3, Na 3 Cl 2 and Cl 2 on the metallic character (which explains the apparent violation of electroneutrality) and only one semiconductor phase NaCl 3 is stable in the range of pressures 250-480000 atmosphere.
"At 3 Cl has a fascinating structure. It consists of layers and layers of pure NaCl sodium. Layers tunel of NaCl act as an insulator while layers of pure sodium conduct electricity. Systems tunel with two-dimensional elektroprovodljivošću have attracted a lot of interest, "says Professor Ogan.
"If this simple tunel system is able to transform into such a diverse range of compounds, providing high pressure, then you are probably capable of it and other systems. [...] This could give an answer to many questions about the origin of the planet's core, as well as to enable the creation of new materials, "said Dr. Gončarov. tunel
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In this task, you will receive two elements with their Valence on the basis of which need to write

Procedure: In addition to the symbols of the elements of the given type in the number of protons and electrons. Then do the electronic configuration in order to know how many valence electrons an element, or to know how much will - should be released (if metal) or as e - should receive (if nonmetal) r134a in order to achieve a stable r134a electron configuration. In addition r134a to the written symbols with the number of protons and electrons on the arrow to write the number of electrons that the element is released, or the number of electrons that element receives and then re-write the symbol of the element and the number of protons and electrons, which are the others when he was fired or receive electrons. Based on the number of laid off or received electrons to conclude that the atom become a positive or negative ion and commemorate the top right corner next to the symbol. Take into account that each element can receive or released only as electrons as there are in the valence level or how much he misses it completely filled valence level. r134a At the end of it all introduce electronic formulas and write the formula of the resulting r134a ion pair.
In this task, you will receive two elements with their Valence on the basis of which need to write a formula that they build compounds, r134a ie to specify the indexes that are the symbols of each element in the molecular formula. The procedure r134a is to first write the symbols of the given elements, unknown to record the indices x and y, then find NZS to date Velence elements and eventually sharing the DCP with the valence of the first element, specify the index x, and dividing NZS with valence other element, specify the index y. Replace the values obtained for xiyi will get the required formula.
III issue: In this issue you will be delegated to the formulas of compounds composed of two elements, one of which has a fixed valence (eg H or O), and the second variable. Your mission is based on the formula and the one known valence valence specify an unknown r134a element with variable valence. Use the rule that the product valence and the number of atoms of one element, must be equal to the valence of the product and the number of atoms of other elements.
x = 4, which means that the of compound of the formula CH 4, the valence of carbon (IV)
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