Jawabanmu

2014-08-26T19:29:36+07:00
21 = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^1
29= 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^9
62= 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^8
1 5 1