Question

define valency? Calculate valencies of elements having atomic numbers 7,9,12&18?​

Answer 1

Answer:

If a number of valence electrons are less than or equal to 4 then, valency = a number of valence electrons. If, the number of valence electrons greater than 4 then, valency = 8 – number of valence electrons. Hence, the valency of the element with atomic number 9 is 1.

Explanation:

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Answer 2

In chemistry, the valence or valency of an element is the measure of its combining capacity with other atoms when it forms chemical compounds or molecules.

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