Question

what do you understand by covalency? give example

Answer 1

Covalency of an atom is the number of electron taking part in the formation of shared pairs. thus, the covalency of hydrogen is one, oxygen is 2,nitrogen 3, carbon 4 .

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Answer 2

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☛ The number of electron shared by one atom of the element to achieve the nearest inert gas electronic configuration is known as covalency.

• For example:- covalency of $\rm\:H_2$ is 1 whereas covalency of $\rm\:O_2$ is 2.

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➤ Electrovalency :-

☛ The number of electron loose or gain by one atom of an element to achieve the nearest inert gas electronic configuration is known as. Electrovalency.

• For example :- Electrovalency of NaCl is 1 and Cl is also 1 and electrovalency of aluminium chloride $\rm\:(AlCl_3)$ , Al = 3 and Cl = 1

➤ valency :-

☛ Valency is defined as the number of electrons gained ,lost or shared so as to make the octet of electrons in the outermost shell.