Question

what is electrovalency and covalency

Answer 1

No. of electrons required to fullfill outermost orbit of atom
through sharing is covalency
through donating or taking is electrovalency

Answer 2

ANSWER-》

Electrovalency- It is the number of electrons lost or gained by an atom of the element to acquire stable configuration during the formation of electrovalent Bond.

Covalency-It is the bond formed by equal contributions and mutual sharing of electrons between two atoms.

hope it helps you out.