Question

What is the valency of magnesium with atomic number 12 and sulphur with atomic number 16?

a. 2 and 2

b. 2 and 6

c. 2 and 4

d. 6 and 2​

Answer 1

Answer:

Atomic number of magnesium =12 Electronic configuration is 2, 8, 2. A magnesium atom can lose its 2 valence electrons to achieve the inert gas electronic configuration of neon (2, 8). Therefore, valency of magnesium = 2. The atomic number of sulphur = 16.

Answer 2

Explanation:

valency of magnesium=2

becoz it gives 2 electrons

valency of sulphur=2

becoz it gain 2 electrons

so..correct of is (a)