Question

how do you determine the valency of an element? what are negative and positive valencies?​

Answer 1

Answer:

If an atom gains electron, then it contains negative charge and valency will be negative. For example :- If Chlorine (Cl) gains one electron, then it's valency will be -1. If an atom loses electrons, then it contains positive charge and valency will be positive.

Explanation:

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Answer 2

Explanation:

Mathematically we can say that if the outermost shell of an atom contains 4 or less than 4 electrons, then the valency of an element is equal to the number of electrons present in the outermost shell and if it is greater than 4, then the valency of an element is determined by subtracting the total number of electrons ...