how can we calculate the valency of elements having atomic number from 24-118

Asked by sanjeev.mami | 25th Dec, 2015, 10:44: AM

Expert Answer:

Valency: It is the number of electrons lost or gained or shared by an atom to become stable.
Valency is determined on the basis of the urge to lose or gain or share electrons by the atom.
Transition elements show variable state oxidation in their compounds. Reason of variable oxidation state    is that there is a very small energy difference in between (n-1)d and ns orbitals. As a result, electrons  of (n-1)d orbitals as well as ns-orbitals take part in bond formation. Variation in oxidation state is related    to their electronic configuration.
Example:
Chromium with atomic number 24 has variable valencies such as   +1, +2, +3, +4, +5, +6.

Answered by Prachi Sawant | 28th Dec, 2015, 10:30: AM