Question

An atom has atomic number 12, what is its valency and name the element?

Answer 1

Answer:

Element name = Magnesium (Mg)

Valency of element = +2

Explanation:

Element with atomic number 12 is Magnesium (Mg). Electronic configuration of magnesium is 1s2 2s2 2p6 3s2. It has 2 e- in its outermost orbit and can donate these to form a stable octet. Hence, its valency is +2.

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Answer 2

Answer:

An atom has atomic number 12

• Valency - +2 ( Configuration - 2,8,2 )
• Name of element - Magnesium