Question

X is an element with atomic number 20.
(i) Is it a metal or a non-metal?
(ii) Among X or Mg, which one is more reactive?
(iii) What is the valency of X?

Answer 1

Answer:

X is Calcium

i) It is an Metal

ii) It is more reactive than Magnesium.

iii) Valency is 2.

Electronic Configuration (2,8,8,2)

Answer 2

Explanation:

Element X - calcium

i ) it is a metal.

ii) calcium (X) is more reactive than Mg.

iii) valency of calcium is +2.

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