Question

Q.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:

Option (a) 2 and 2 is correct answer

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Answer 2

Answer:

Magnesium Valency - (2)

Sulphur Valency - (2)

Explanation:

Magnesium atomic number is 12 so it's electronic configuration is 2,8,2

And we know that the outermost shell indicates the valency

So in its outermost shell the electrons are 2

So the valency is 2

Sulphur atomic number is 16 so it's electronic configuration is 2,8,6

And we know that the outermost shell indicates the valency

So in its outermost shell the electrons are 6

And the formula of valency for non - metals is 8- number of electrons present in outermost shell

So the valency is 6-8 = 2