Question

What is electropositivity?

Answer 1

it is measure of an elements ability to donate  electron and form positive  ion

Answer 2

Metallic elements tend to denote electrons to achieve stable electronic configuration and thus form positive ions. Such a nature of metals is called electropositivity.

For eg.
Al → Al³⁺ + 3e⁻
Mg → Mg²⁺ + 2e⁻