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Strontium selenide is a luminescent compound with the chemical formula SrSe. It is a rare earth element and it has a high melting point of 1740 °C. Strontium selenide is a transparent material with an orange-red luminescence spectrum. The material is used in cathode ray tubes for televisions. It can also be found in pyrotechnics and fireworks to achieve a bright red color.

The crystal structure of strontium selenide is a face-centered cubic lattice with an edge length of 3.117 . The crystalline form of the substance has a density of 1.45 g/cm3. It is prepared by precipitating a solution of strontium nitrate with sodium hydroxide and washing the precipitate with cold ethyl alcohol.

Biologically, strontium is non-toxic. A daily intake of up to 5 mg of the element through food is safe for humans. Animals have a requirement for the element and use it to build shells. Deep sea organisms also apply the compound to their bones and stones. Radioactive 89Sr, which is a product of nuclear explosions, has contaminated the environment. It primarily accumulates in the hypophysis and ovaries, and can cause birth defects and inhibit infant growth.

Chemically, atomic weight is the standard atomic mass unit that is used to determine how many moles of a particular substance are present. It is calculated by multiplying the number of atoms of each element in a compound by the relative atomic masses of those atoms. This value is used in chemistry to calculate stoichiometry, which tells how many reactants are needed to produce a given amount of a compound.

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