Using the information provided in the table, write a symbol for each atom. If there is not enough information, state what additional information is needed to write a correct symbol for that atom.
| Atom of element | |||
| A | B | C | D |
Number of electrons | 10 |
| 21 | 50 |
Number of protons |
| 75 | 21 | 50 |
Number of neutrons | 12 | 110 | 21 |
|
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