Question
What are their harmful effects?
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| Element | Symbol | No. of Protons | No. of Neutrons | No. of Electrons |
| Sodium | ${ }_{11}^{23} NA$ | $11$ | $P$ | $11$ |
| Chlorine | ${ }_{17}^{35} Cl$ | $Q$ | $18$ | $17$ |
| Uranium | $R$ | $92$ | $146$ | $92$ |
| $S$ | ${ }_9^{19} F$ | $9$ | $10$ | $9$ |