Which of the following is not an actinoid?
A. Curium (Z = 96)
B. Californium (Z = 98)
C. Uranium (Z = 92)
D. Terbium (Z = 65)
Terbium is a lanthanoid as it has z=65. Actinoids are the elements which have an atomic number in the range of 89-103.
As shown in the above periodic table Tb is a lanthanoid and is in that series.
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What are the major differences between metals and non-metals?NCERT - Chemistry Part-I