Strontium
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Strontium is a chemical element; it has symbol Sr and atomic number 38. An alkaline earth metal, it is a soft silver-white yellowish metallic element that is highly chemically reactive. The metal form
Strontium destilled crystals
Oxidized dendritic strontium
The mineral celestine (SrSO4)
Most of the world's production of strontium used to be consumed in the production of cathode-ray tube (CRT) displays. The glass contained strontium and barium oxide to block X-rays.
Rubidium
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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 m
Strontium
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Rb 5
Partially molten rubidium metal in an ampoule
Rubidium crystals (silvery) compared to caesium crystals (golden)
Flame test for rubidium