Copy and complete the following table
| Element | Number of Neutrons | Electronic Configuration | Group in the periodic Table |
| (^{23}_{11}Na) | — | 1s(^{2})2s(^{2})2p(^{6})3s(^{1}) | 1 |
| (^4_2He) | 2 | —- | — |
| —- | 7 | 1s(^{2})2s(^{2})2p(^{2}) |
—- |
Explanation
| Element | Number of Neutrons | Electronic Configuration | Group in the periodic Table |
| (^{23}_{11}Na) | 12 | 1s(^{2})2s(^{2})2p(^{6})3s(^{1}) | 1 |
| (^4_2He) | 2 | 1s(^{2}) | O or VIII or 8 |
| (^{13}_6C) | 7 | 1s(^{2})2s(^{2})2p(^{2}) | IV or 4 |