Question

Define Valency of a element

Answer 1

$\textbf{\large{Answer -}}$

Valency is the measurement of electrons an atom can share.

Valency is the combining power by which it combines with different atoms to form molecules or chemical compound.

Valency of the atom is the measurement of the hydrogen atoms that will combine either it will take or give to complete it's orbit.

For example,

Valency of Oxygen is 2 since it has 6 electrons in it's outermost shell and need two.

Answer 2

What is valency ?

=> Valency is the combining capacity of an atom with another atom (s) .

This is normally given by the number of Valence electrons or by 8 minus the Valence electrons (Only when the number of Valence electrons is more than 4) .

Valency of first 20 elements is given below.
1) Hydrogen (H) = 1

2) Helium (He) = 0

3) Lithium (Li) = 1

4) Beryllium (Be) = 2

5) Boron (B) = 3

6) Carbon (C) = 4

7) Nitrogen (N) = 3

8) Oxygen (O) = 2

9) Fluorine (F) = 1

10) Neon (Ne) = 0

11) Sodium (Na) = 1

12) Magnesium (Mg) = 2

13) Aluminium (Al) = 3

14) Silicon (Si) = 4

15) Phosphorus (P) = 3, 5

16) Sulphur (S) = 2

17) Chlorine (Cl) = 1

18) Argon (Ar) = 0

19) Potassium (K) = 1

20 ) Calcium (Ca) = 2

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