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Sodium atom and sodium ion
Sodium atom and sodium ion
| Sodium atom | Sodium-ion |
| Sodium atom is electrically neutral. | Sodium-ion is positively charged. |
| In sodium atom, there are 11 protons and 11 electrons, i.e. an equal number of protons and electrons. | In sodium-ion, there are 11 protons but 10 electrons, i.e. sodium ion contains a lesser number of electrons. |
| The sodium atom has only one electron in its valence shell. | Sodium-ion has 8 electrons in its valence shell. |
| The size of a sodium atom is larger than a sodium ion. | The size of a sodium ion is smaller than a sodium atom. |
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| Pressure in atmosphere | Volume in liters |
| $0.20$ | $112$ |
| $0.25$ | $89.2$ |
| $0.40$ | $56.25$ |
| $0.60$ | $37.40$ |
| $0.80$ | $28.10$ |
| $1.00$ | $22.4$ |