1. 29Cu2+ = 1S2 2S2 2P6 3S2 3P6 3d9 = (C)
2. 22Ti3+ = 1S2 2S2
2P6 3S2 3P6 3d1 = (B)
3. 16S2- = 1S2 2S2
2P6 3S2 3P6
4. jumlah elektron terluar = 6
5. 7 orbit
6. 2 elektron
7. 4
sorry if find problem ....
thank....