Question

Diagonal relationship is not shown by:

• A. $Li\text{and}Mg$
• B. $B\text{and}Si$
• C. $C\text{and}P$
• D. $Be\text{and}Al$

Answer 1

The correct option is C $C\text{and}P$

A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and the third period of the periodic table due to their identical size.
Only metals of second period and group $1,2,13$ show diagonal relationship. So, $C$ and $P$ do not show diagonal relationship.