ae giup minh vs cam on =)))))))))))))))))))))))

Bạn tham khảo:

`X: 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{2}`

- Vị trí: `22`

- Chu kì: `4`

- Nhóm: `IVB`

`X^{2+}: 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}`

`X^{4+}: 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}`