Lanthanoid is (a) 14 elements in the sixth period (atomic number \(...
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0Lanthanoid is
(a) 14 elements in the sixth period (atomic number \( =90-103 \) ) that are filling \( 4 f \)-sublevel
(b) 14 elements is the seventh period (atomic number \( =90-103 \) ) that are filling \( 5 f \)-sublevel
(c) 14 elements in the sixth period (atomic number \( =58-71 \) ) that are filling the \( 4 f \)-sublevel
(d) 14 elements in the seventh period (atomic number \( =50 \) to 71) that are filling the \( 4 f \)-sublevel
\( \mathrm{P} \)
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