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What element, atomic number 55, a member of the alkali metals, takes its name from Latin 'sky-blue'?
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| Caesium (Cs) |
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| Darmstadtium (Ds) |
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| Iridium (Ir) |
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| Boron (B) |
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Caesium (Cs) takes its name from the Latin caesius, 'sky-blue'.
Atomic number 55, it has a standard atomic weight of 132.90545196, a melting point of 301.59 degrees Kelvin, a boiling point of 944 degrees Kelvin, and is a member of the alkali metals and Period 6.
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