Hydrogen
Chaitra
26/06/2026 19:58:08
Updated 26/06/2026 19:58:08
| Property |
Value |
| Atomic Number |
1 |
| Element |
Hydrogen |
| Symbol |
H |
| Atomic Mass |
1.008 u |
| Number of Neutrons |
0 (most common isotope, Protium) |
| Number of Protons |
1 |
| Number of Electrons |
1 |
| Period |
1 |
| Group |
1 |
| Phase |
Gas |
| Radioactive |
No |
| Natural |
Yes |
| Metal |
No |
| Nonmetal |
Yes |
| Metalloid |
No |
| Type |
Diatomic Nonmetal |
| Atomic Radius |
53 pm |
| Electronegativity |
2.20 (Pauling scale) |
| First Ionization Energy |
13.598 eV |
| Density |
0.00008988 g/cm³ |
| Melting Point |
−259.16 °C |
| Boiling Point |
−252.87 °C |
| Number of Isotopes |
3 (Protium, Deuterium, Tritium) |
| Discoverer |
Henry Cavendish |
| Year |
1766 |
| Specific Heat |
14.304 J/g·K |
| Number of Shells |
1 |
| Number of Valence Electrons |
1 |
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