Rare card
Rubidium
- Value
- 50 W
- Attack
- 297
- Defence
- 238
- Players
- 0
Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. Rubidium is the first alkali metal in the group to have a density higher than water.
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