The reason for greater range of oxidation states in actinoids is attributed to
(a) actinoid contraction
(b) $5f$, $6d$ and $7s$ levels having comparable energies
(c) $4f$ and $5d$ levels being close in energies
(d) the radioactive nature of actinoids.
(a) actinoid contraction
(b) $5f$, $6d$ and $7s$ levels having comparable energies
(c) $4f$ and $5d$ levels being close in energies
(d) the radioactive nature of actinoids.