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Carbon is a Group 14 element and is distributed very widely in nature. It is found in abundance in the sun, stars, comets, and atmospheres of most planets. Carbon is present as carbon dioxide in the atmosphere and dissolved in all natural waters. It is a component of rocks as carbonates of calcium (limestone), magnesium, and iron. The atmosphere of Mars is very thin but what there is contains about 95 % CO 2. Coal, petroleum, and natural gas are chiefly hydrocarbons.
The other compound is SnCl 4. In this compound, tin forms four bonds and thus has a valence of four. In other words, tin displays a valence of two in some of its compounds and a valence of four in others.Similarly, other elements, such as iron, copper, tin, nickel, and sulphur, display more than one valence.he valences derived from the number of unpaired electrons are the normal or expected valences of the elements. However, some elements display a valence other than the normal valence. For example, when tin and chlorine react, one of two different products may form.