Question

how to understand valancy​

Answer 1

We know valency is the capacity of an atom to combine with a particular number of atoms of another element. In the case of ammonia, one nitrogen atom combines with 3 hydrogen atoms. The atomic number of hydrogen is 7. The electronic configuration is 2, 5.

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Answer 2

Answer:

the valency of an element is a measure of its combining power with other atoms when it forms chemical compound or molecule