Strontium-90 is a shiny, whitish metal that gets oxidized when exposed to air leading to the formation of a pale yellow coating. Strontium-90 has a molecular weight of 87.62 grams per mole and a density of 2.64 grams per cubic centimeter. Being a group 2 element, strontium-90 has two electrons in its outermost energy shell. To form an ion, it loses these two electrons in an energy-requiring process. The amount of energy required to lose the first electron is 549.2 kJmolÂ -1, whereas 1064 kJmolÂ -1Â is needed for the second electron to be lost. Strontium-90 decomposes in water and dissolves in organic solvents such as ethanol. The melting point ofÂ 90Sr is 777Â oC while its boiling point is 1382Â oC. At temperatures of approximately 847Â oC, strontium-90 produces a vapor pressure of 5 mmHg.
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