Jawabanmu

2014-09-07T12:24:07+07:00
1.1s2,2s2,2p6,3s2,3p2
2.1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p6,5s2,4d1
3.1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p6,5s2,4d10