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For the configuration 1s²2s¹, the quantum numbers for the outermost electron are

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2, 0, 1, +1/2

2, 1, 0, –1/2

2, 0, 0, +1/2

2, 1, 0, +1/2

answer is B.

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Detailed Solution

The quantum numbers for the outermost electron(2s electron) are,

n=2, l=0, m=0, s=+1/2 or -1/2

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