Question

Element X has 12 protons in its nucleus. To which group in the periodic table would it belong?

• A. IVA (14)
• B. IIA (2)
• C. IIIA (13)
• D. VIA (16)

Answer 1

The correct option is B

IIA (2)

Explanation for Correct option:

B) The element X with 12 protons in its nucleus is Magnesium.

Electronic configuration: $1s^{2}2s^{2}2p^{6}3s^2$

Since, it has 2 electrons in the valence shell- it belongs to IIA or 2 group since group number is equal to valence electrons.

Explanation for Incorrect options:

A)IVA group element should have 4 electrons in the valence shell.

C)IIIA group element should have 3 electrons in the valence shell.

D)VIA group element should have 6 electrons in the valence shell.

Hence, B) is the correct option - The element X with 12 protons belongs to IIA or 2 group.