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Suppose the universe were different than...

Suppose the universe were different than it is and that the electron spin quantum number could only have of a value of `+(1)/(2)` . Assume that the Pauli's exclusion principle still holds and that the value of other quantum numbers were the same, which atomic number could correspond to the "noble gases" in this universe?

A

1,5,9...

B

2, 10, 18...

C

3,27,54...

D

1,4,8...

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The correct Answer is:
A
In this case , the number of elements in a period would be just half of the number present now . Hence , correspoding atomic numbers would be : 1,5,9…….. (Half of the present atomic number).
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