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Yogita Ingle 6 years, 4 months ago
The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds. It was postulated by Kossel & Lewis. The atoms complete their octet by either loosing or gaining of electrons. They do so to attain the nearest noble gas stable electronic configuration .for example
The octet rule successfully explained the formation of chemical bonds depending upon the nature of the element.
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Environmental Chemistry is the branch of science/chemistry which deals with the chemical changes in the environment. It includes our surroundings such as air, water, soil, forest etc. It is science to understand environmental phenomenon.
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<font size="2"><font style="box-sizing: border-box;">CCl4 has a tetrahedral shape, owing to four bond pairs of electrons repelling each other to positions of maximum separation and minimum repulsion. The angle between bonds is 109.5 degrees.</font></font>
<font size="2"><font style="box-sizing: border-box;">In the carbon tetrachloride molecule, four chlorine atoms are positioned symmetrically as corners in a tetrahedral configuration joined to a central carbon atom by single covalent bonds. Because of this symmetrical geometry, the molecule has no net dipole moment; that is, CCl4 is non-polar. Methane gas has the same structure, making carbon tetrachloride a halomethane. As a solvent, it is well suited to dissolving other non-polar compounds, fats and oils. It can also dissolve iodine. It is somewhat volatile, giving off vapors having a smell characteristic of other chlorinated solvents, somewhat similar to the tetrachloroethylene smell reminiscent of dry cleaners' shops.</font></font>
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Yogita Ingle 6 years, 4 months ago
The total number of protons present in the nucleus of an atom represents the atomic number of a particular atom. Every atom of a particular element is composed of the same number of protons and therefore have the same atomic number. However, atoms of different elements have unique atomic numbers that vary from one element to the other.
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