Question

which of the following charged ions will be formed by an element of group IIA having electronic configuration 1s² 2s²2p6 3s²

Answer 1

Answer:

Correct option is (C).

Explanation:

A number of electrons present in valence shell of penultimate shell represents the group of elements.

For s block elements: no.of group= number of valence shell electron.

p block elements:no.of group=2+10+ number of valence electrons.

d block elements:no.of group=number ( n–1) d electrons + number of electrons in nth shell.

Here, the differential electron is in p orbital hence, it belongs to p block no. of group=2+10+3=15 I.e 15th group of V A group.