Question
What is Mendeleev’s periodic law?
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| Name | Symbol | Absolute charge/C | Relative charge | Symbol for Charge | Mass/KG | Mass/u | Approximate mass/u |
| Electron | $\mathrm{e}^{-}$ | $-1.6022 \times 10^{-19}$ | $-\mathrm{e}$ | $9.10938 \times 10^{-31}$ | 0.00054 | ||
| Proton | p | +1 | $1.6726 \times 10^{-27}$ | 1.00727 | |||
| Neutron | n | 0 | $1.67493 \times 10^{-27}$ | 1.00867 | 1 |