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n=2 ; l=1 ; m=0 ; s=+1/2
2.₂₆Fe = [Ar] 3d⁶ 4s²
n=4 ; l=2 ; m=-2 ; s=-1/2
3. ₂₉Cu = [Ar] 3d¹° 4s¹
n=4 ; l=2 ; m=+2 ; s=-1/2
4. ₄₇Ag = [Kr] 4d¹° 5s¹
n= 5 ; l=3 ; m=+2 ; s=-1/2