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Q.

What is the valency of magnesium?

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a

2

b

1

c

3

d

4

answer is B.

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Detailed Solution

Valency is the combining power of atoms of an element with other atoms to form a molecule.
For Magnesium,
Atomic Number = 12
Electronic configuration = (2,8,2)
Magnesium needs to donate 2 electrons from its outermost shell to become stable. So its valency is 2.
 

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