Define electrovalency. What are types of electrovalency? 

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Answer :

Definition: The number of electrons that an atom of an element gains or loses to complete its last orbit is called electrovalency. 

Types of Electrovalency:- 1) Positive Electrovalency 2) Negative Electrovalency

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Description : Assertion:- In MgO electrovalency of Mg is 2. Reason :- Mg shares two electrons with oxygen.

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