Valency is the combining capacity of an element. The total number of electrons in the outermost shell varies from 1 to 8 there for the combining capacity will always be 1,2,3,4,5,6,7 or 8. Therefore valency is always positive.
What does the positive and negative number of valency indicate?
the word negative means here that the atom contains electron. for positive means that deficiency of electron. Hope it helps you.
What does negative valency mean?
1 : the valence of a negatively charged ion. 2 : the number of electrons an atom can take up oxygen has a negative valence of 2.