Question

Diagonal relationship is shown by:
A.Elements of first period
B.Elements of second period
C.Elements of third period
D.Elements of fourth period

Answer 1

It is important for us to recall that a diagonal relationship in a periodic table, is due to the polarizing power, that is, the ionic charge or ionic radius. This ionic charge is similar for the diagonally placed elements.

Complete answer:
- A diagonal relationship in a periodic table is shown by S-block elements. It is known to exist between certain adjacent elements.
- The properties of S block elements vary significantly when compared to the other elements of the sub-group they belong to.
- The diagonal neighbours show a lot of similarities. Such a relationship is exhibited as you move left to right and down the group, since the periodic table has opposing factors.
- These relationships occur because of the different ways in which many atomic properties vary down groups and across periods of the Periodic Table.
- Diagonal relationship is shown by S-block elements which are located in the second and third period of the periodic table.

Therefore, the answer to the question is option (B) Elements of second period and (C) Elements of third period.

Note:
On moving diagonally across the periodic table, the elements show certain similarities which are however far less pronounced than the similarities within a group. This relationship is particularly noticeable in the elements of the second and third periods of the periodic table.