Question

Among the first four alkali metals in group 1 of the periodic table Li, Na, K, Rb the most electro positive metal is

Answer 1

Electopositivity increases down the group so Rb is moat Electopositive.

Answer 2

Answer: Rb

Explanation:-

Electropositivity is defined as the property of an element to lose a electron with ease to acquire a positive charge.

In a group, as we move down from lithium to rubidium, the ionization energy decreases as we move down as the size increases and thus the valence shell moves farther from nucleus and thus is easier to remove the electron and thus electropositivity increases.

Thus Rubidium has highest electropositivity.