Question

explain valence electrons. explain valency​

Answer 1

Answer:

In chemistry and physics, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed

the valence or valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules

Answer 2

valence electrons is the number of shell present in the valence shell i.e the outermost orbit...

valency is the number of electrons lose , gain or share to complete it's last orbit..