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JEE Advanced levelSingle correct optionDifficulty 3 of 3pt036

A trivalent cation $M X^{3 +}$ of an f-block element has the ground-state configuration $[Xe] 4 f^{3}$ (the $[Xe]$ core has 54 electrons). The atomic number of M and its period are

A57, period 6
B63, period 6
C60, period 7
D60, period 6

Answer: D

The ion has

54 + 3 = 57

electrons. The neutral atom has three more electrons, so

Z = 60

(neodymium). The 4f series belongs to period 6.

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