Question

Which of the following element will show almost same reactivity like $Ca$ ?

• A. $Cr$
• B. $Mn$
• C. $Sc$
• D. $Na$

Answer 1

The correct option is D $Na$

A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods of the periodic table. Diagonal relationships occur because of the directions in the trends of various properties as you move across or down the periodic table. Many of the chemical properties of an element are related to the size of the atom.

$Ca$ and $Na$ show diagonal relationship hence, similar properties. Hence, they show almost same reactivity.