Question
Verify experimentally the laws reflection of sound.
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| Symbol | Atomic No. | Electronic Configuration |
| 1) He | 2 | ? |
| 2) Ne | ? | 2,8 |
| 3) Ar | ? | 2, 8,8 |
| 4) Na | 11 | ? |
| Formula | Name of the ion | ||
| 1) | H_(3)O^(+) | - | ? |
| 2) | ? | - | Acetate ion ? |
| 3) | PO_(4)^(3-) | - | ? |
| 4) | ? | - | Sulphate ion |
| 5) | NO_(3)^(-) | - | ? |