The correct statement about the actinoids is:

Question

Canvas Classes · Accepted Answer

Actinoids (Z = 89–103, filling 5f orbitals):

A. All actinoids are non-radioactive — FALSE ✗

All actinoids are radioactive (unlike lanthanoids where only Pm is radioactive).

B. Elements beyond U (Z=92) are transuranium/man-made — TRUE ✓

Np (93), Pu (94), Am (95), Cm (96)... are all synthetic elements made in nuclear reactors or accelerators.

C. Actinoids show only +3 O.S. — FALSE ✗

Actinoids show a wide range of oxidation states (+2 to +7), more than lanthanoids, because 5f, 6d, and 7s elec

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