Question

The electronic configuration which corresponds to an alkali metal is

• A. 2, 2
• B. 2, 8, 2
• C. 2, 8, 1
• D. 2, 8, 8

Answer 1

The correct option is C

2, 8, 1

Alkali metals have elements with one electron in the valence shell. They belongs to group 1.

Explanation for the correct option:

Number of valence electrons = Number of group.

So, electronic configuration of alkali metal is 2, 8, 1,

Explanation for the incorrect option:

Group 2 elements contain 2 electrons in the valence shell.

Electronic configuration of 2, 2 belongs to group 2.

Electronic configuration of 2, 8, 2 belongs to group 2.

Electronic configuration of 2, 8, 8 belongs to group 18.

Final answer:

Hence, option (C) is the correct option.