Question

Hindi Divas ki Pratiyogita Mein Bhag lene ke liye mukhyadhyapak Ji ko Patra​

Answer 1

Explanation:

Valency is a measure of the reactivity of an atom or molecule. You can derive the valency of many elements by looking at their positions in the periodic table, but this isn't true for all of them. It's also possible to calculate the valency of an atom or molecule by noting how it combines with other atoms or molecules with known valencies.