Question

The subshell electronic configuration of some elements are given below.
A- 1s 2 ,2s 2 ,2p 6 ,3s 2 ,3p 5
B-1s 2 ,2s 2 ,2p 6 ,3s 2
C-1s 2 ,2s 2 ,2p 6 ,3s 2 ,3p 6 ,3d 3 ,4s 2
a) Which element has the highest ionisation energy ?
b) Which element shows variable oxidation state ?
c) Which element belongs to second group ?
d) Write the chemical formula of the compound formed by the reaction between element A&B .​

Answer 1

Answer:

a. A

b.both A and C

c. B

d B3A2

Explanation:

as it belongs to p- block which has highest I.E

as it C is a transition metal and A with different elements

as it has 2 electron in outermost shell

as b has 2 electron extra to complete it's octet and A requires 3 more.