If n and l are respectively the principal and azimuthal quantum numbers, then the expression for calculating the total number of electrons in any orbit is

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∑l = 1l = n22l+1

∑l = 1l = n −122l+1

∑l = 0l = n +122l+1

∑l = 0l = n −122l+1

answer is D.

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Detailed Solution

Total number of electrons in an orbital = 22l+1.The value of l varies from 0 to n - 1.∴ Total numbers of electrons in any orbit =∑l = 0l = n-122l+1.

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