Question

what is meant by valency of an element what is the relationship between the number of valence electron and valency

Answer 1

the electrons in the outermost shells represent a valency of the element in genral we can say that number of electrons present in the outermost shell are the valence electrons acid vitamin the valency of the element

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.