Question

Assertion- The elements having 1s2 2s2 2p6 3s2 and 1s2 2s2 configuration belong to the same group.

Reason- These have same number of valence electrons.​

Answer 1

Answer:

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 or VA grou

Answer 2

Answer:

can u tell what option it will be