There is no difference between valency and valence electrons except in the case of
Answers
Answer:
Non metals.
Explanation:
Metals donate their valence electrons to form a complete octet, and non metals gain electrons to complete their octet. The valency of metals is the number of valence electrons in one atom of the metal, but the valency of a non metal is actually 8 - (number of valence electrons).
Consider Calcium as an example. It is a metal having two valence electrons, which it donates to achieve an octet. So, it's valency is 2, which is equal to the number of valence electrons.
Consider chlorine, which is a non metal. It is one electron short of completing its octet, and has 7 valence electrons. However, it's valency is not 7, its valency is (8 - 7 = 1), which can also be seen from the fact that it is one electron short of completing its octet.
Hope it's clear.
Thanks!
Answer:
valency is the ability of an atom to lose or gain electrons while valence electons is the no. of electrons in its outermost shell. ... The numbers of electrons in outermost shell (or) valency shell of an atom are called valency electrons. Based on valency electrons the group number of an atom can be found.