Tolong dikerja sekrng jgn asal kerja

1. a. 21SE= 1s, 2s, 2p, 3s, 3p, 4s,3d
periode=4
golongan=III B
b. 23V= 1s, 2s, 2p, 3s, 3p, 4s, 3d
periode=4
golongan=V B
c. 27 CO= 1s, 2s, 2p, 3s, 3p, 4s, 3d
periode=4
golongan= VIII B
d. 30 ZN=1s, 2s, 2p, 3s, 3p, 4s, 3d
periode= 4
golongan= II B
2. 1s, 2s, 2p, 3s, 3p, 4s, 3d
no atomnya= 24