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Oxygen, Sulfur, and Selenium make up a triad. The atomic mass of oxygen is 15.999 amu, the atomic mass of selenium is 78.96 amu. Use this information to calculate the atomic mass of sulfur.

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Answer:

Explanation:

Selenium is a chemical element with the symbol Se and atomic number 34.

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Selenium

Melting point 494 K ​(221 °C, ​430 °F)

Boiling point 958 K ​(685 °C, ​1265 °F)

Density (near r.t. ) gray: 4.81 g/cm3 alpha: 4.39 g/cm3 vitreous: 4.28 g/cm3

when liquid (at m.p. ) 3.99 g/cm3

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