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Chemistry
Nehemiah
16 December, 11:00
I am a gas with the mass number of 19
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Santiago
16 December, 12:27
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I assume by 'mass' it means atomic mass, which is listed in order on the periodic table, so find whatever element on the periodic table has an atomic mass of 19.
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Royce Chen
16 December, 12:40
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Your answer is potassium
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