Q.

The number of elements in a period is

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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
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