Interesting Facts
- Rubidium is the 33rd most abundant element in the universe (1 x 10^-6%).
- Rubidium is the 25th most abundant element in the Earth's crust (0.006%).
- Rubidium is used in some atomic clocks (cesium clocks are more accurate).
- Because rubidium can easily be ionized, it may be used in 'ionic propulsion systems' in rockets.
- When rubidium burns, it burns in a red/purple color. Because of this, it is used in red/purple fireworks.
- Rubidium is used in television vacuum tubes as a 'getter'; it removes trace gases such as argon.
- Most rubidium comes as a by-product of refined lithium.
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