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Each orbital can contain a maximum of 2 electrons only different in their spin momentum: +1/2 and -1/2.

The 4s orbital is fully 'used' from Ca (no.20) onward: 1s2 2s2 2p6 3s2 3p6 4s2

The 4s2 suborbital quantum numbers are: (s for spin direction: CW or CCW)

n=4, m=0, l=0, s= +1/2, or n=4, m=0, l=0, s= -1/2.

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