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Question
Which of the following is not an actinoid?
Options
Curium (Z = 96)
Californium (Z = 98)
Uranium (Z = 92)
Terbium (Z = 65)
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Solution
Terbium (Z = 65)
Explanation:
Actinoids are elements with Z = 90 – 103. Therefore, Terbium (Z = 65) is not an actinoid. Terbium (Z = 65) is a lanthanoid. Tb: [Xe]4f95d06s2
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