AP EAPCET 18 May 2024 Shift 1 Solved Paper

The correct set of four quantum numbers for the valence electron of strontium ( Z=38 ) is derived from its electronic configuration.
Electronic Configuration of Strontium (Z=38) :
1s22s22p63s23p64s23d104p65s2
For the Valence Shell Electron (5s2) :
Principal Quantum Number ( n ): 5
Azimuthal Quantum Number ( l ): 0 (since it is an s-orbital)
Magnetic Quantum Number (m):0 (since m ranges from −l to +l, and for l=0,m=0 )
Spin Quantum Number: ‌

1

2

Thus, the correct set of quantum numbers for the valence electron is (5,0,0,‌

1

2

).