Question

what is mean by valency of an element what is the relationship between the number of Valence Electrons and valency

Answer 1

THE NO.OF HYDROGEN ELEMENT IS DEFINED as VALANCY
THE VALANCE ELECTRON ARE THE ELECTRONS in the LAST SHELL
THE NO.OF VALANCE SHELL= VALANCY OF THE ELEMENT
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Answer 2

The number of electrons in an atom is always the same as the number of protons, so atoms are electrically neutral over all. Atoms can loss or gain electrons. If an atom gains one or more electrons, it becomes a negativity changed ions.