
Group 1 elements
Group 1 of the periodic table contains these elements: Hydrogen, Lithium, Sodium, Potassium, Rubidium, Cesium, Francium.
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| No. | Symbol | Element | Atomic weight (u) | Density (g/cm³) | Melting point (K) | Boiling point (K) | Electronegativity | Discovered |
|---|---|---|---|---|---|---|---|---|
| 1 | H | Hydrogen | 1.0079 | 0.08988 | 13.99 | 20.271 | 2.2 | 1766 |
| 3 | Li | Lithium | 6.938 | 0.534 | 453.65 | 1603 | 0.98 | 1817 |
| 11 | Na | Sodium | 22.9898 | 0.968 | 370.944 | 1156.09 | 0.93 | 1807 |
| 19 | K | Potassium | 39.0983 | 0.862 | 336.7 | 1032 | 0.82 | 1807 |
| 37 | Rb | Rubidium | 85.4678 | 1.532 | 312.45 | 961 | 0.82 | 1861 |
| 55 | Cs | Cesium | 132.905 | 1.93 | 301.7 | 944 | 0.79 | 1860 |
| 87 | Fr | Francium | 223 | 1.87 | 300 | 950 | 0.79 | 1939 |