Question

5. Explain valency with an example.​

Answer 1

Answer:

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell. Group number.

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.

Answer 2

Answer:

Valency:

• Valency is defined as the combining capacity of the element. It is determined by the number of valence shell electrons present in the atom. 

• If the number of valence electrons is less than or equal to 4 so the valency is the same as the number of electrons present. 

• If the number of valence electrons is more than 4 then the valency is 8-(the number of valence shell electrons).

Example:

• (1)Silicon has atomic number 14. The electronic configuration of silicon is 2, 8, 4. The number of valence electrons is 4. So the valency is 4.

• (2)Oxygen has an atomic number 8. The electronic configuration is 2, 6. The valency is (8-6)=2.