Question

2
Study the following and answer.
H
Li
Rb
Cs
Fr
i. Fill in the missing blocks ?
ii. Give the electronic configuration of any 3 elements and what similarity do you observe ?
iii.Identify the group to which all these elements belong with reason ?
iv. What special name to given to the group?
v. To which block does the group belong from S,P,D or F block?​

Answer 1

Answer:

i.) Li

Na

Rb

ii.) element (A.N) - electronic configuration

H(1) - 1s1

Li(3) - 1s2 2s1

Na(11) - 1s2 2s2 2p6 3s1

iii.) They all have nS1 in last , so they belong to first group.

iv.) They are known as Hydrogen family

v.) Since, there electronic configuration have nS1 in last so they belongs to S block and are known as S block element.