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Groups in Modern Periodic Table

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From the formula of CO2, we can frame the valencies of carbon and oxygen. But, the valencies of Carbon and oxygen will differ when in Carbon - Monoxide(CO). What is the reason ?

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The valency of carbon is 4 and that of oxygen is 2. What is the molecular formula of carbon dioxide?

Q. Valency of carbon is

44. From this, we understand that there are ____chemical bond/bonds between the carbon atom and one oxygen atom in the compound-carbon dioxide.

Q. What do you mean by valence electrons? Find out the number of valence electrons in carbon, hydrogen, and oxygen.

Valency and oxidation number are different for an element. Valency of carbon is generally

4

, however, the oxidation state may be

- 4, - 2, 0, + 2, - 1

, etc. In the compounds containing carbon, hydrogen and oxygen, the oxidation number of carbon can be calculated as: Oxidation number of carbon

= \frac{2 n_{O} - n_{H}}{n_{C}}

n_{H}, n_{O}

n_{C}

are number of respective atoms.

In which of the following compounds, the valency of carbon is two?

The number of valence electrons in the atoms of carbon, nitrogen and oxygen respectively are __________.

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Groups in Modern Periodic Table

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