Question

The given table shows elements with same number
of electrons in its valence shell.
Elements lA l B l C. l
m.p. l63.0 l 180.0 l 97.0 l
State:
(i) Whether these elements belong to same group or
period.
(ii) Arrange them in order of increasing metallic
character.​

Answer 1

Answer: they belong to the same group

Explanation: elements which belong to same group have same outer electronic configuration

For example

Li and Na

1s2 2s1 1s2 2s2 2p6 3s1

Both have outer EC as ns1