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a
2 × number of orbitals available for filling
b
2 × number of subshells available for filling
c
2 × number of principal Q.N.
d
all of these
answer is A.
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Detailed Solution
Examples: 1st period - filling of s-orbital → 2 elements2nd period - filling of one s and three p-orbitals → 8 elements4th period - filling of one s, five d and three p-orbitals →18 elements