Question

what is valency
describe it
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Answer 1

Explanation:

IN SHORT

a measurement of the power of an atom to combine with others, by the number of hydrogen atoms it can combine with or take the place of

Answer 2

Answer:

The valency of an element is the number of hydrogen atoms that can combine with or replace (either directly or indirectly) one atom of the element.

Explanation:

In other words, the valency of an element is the number of electrons an atom of the element uses to combine with atoms of other elements - it is the combining power of an atom of the element. In an atom, the valence electrons are the electrons that can be used in combining with other atoms - these are the electrons in the orbitals of the outermost shell (also called valence shell).

Notice that it is not in all cases that the valency of an atom equals the total number of its valence electrons. For example, oxygen has six valence electrons, but its valency is 2. Some elements may have more than one combining power (or valency), while others have just one.

For example, H →1; Mg→2; Al→3; C→4; N→3, and 5; P→3 and 5; O→2; S→ 2, 4 and 6; Cl→ 1; and Ne→0.