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HardChemistry
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Lanthanoids are -
A
14 elements in the seventh period (Atomic no. = 58 to 71) that are filling 4f subshell
B
14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f subshell
C
14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f subshell
D
14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f subshell
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The pair of amphoteric hydroxides is -

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