- They all react a similar way in water:
metal and water -------> metal hydroxide and hydrogen
2M(s) 2H2O(l) 2MOH(aq) H2(g)
- alkali metals
- reactive metals
- shiny silver when freshly cut
- low density
- low melting point
| Metal | Observations |
|---|---|
| Lithium (Li) | Fizzes, floats and moves on the water surface |
| Sodium (Na) | Fizzes, floats, forms a ball and moves around surface of water (may ignite) |
| Potassium (K) | Fizzes, reacts vigorously and burns with a lilac flame (sometimes explodes) |
Summary: Group 1 elements get more reactive as the atomic number increases
1. Atoms increase in size
2. Outer electrons further from nucleus
3. Therefore they are easily lost
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