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An Intiative by Sri Chaitanya
a
14 elements in the seventh period (90-103) that are being filled into 5f-subshell
b
14 elements in the sixth period (58-71) that are being filled into 4f-subshell
c
14 elements in the seventh period (58-71) that are being filled into 4f-subshell
d
14 elements in the sixth period (90-103) that are being filled into 4f-subshelI
answer is B.
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