Answers

2016-04-11T21:36:48+05:30
It is measure of an elements ability to donate  electron and form positive  ion

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2016-04-11T23:34:24+05:30
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⁻

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