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16 December, 11:00

I am a gas with the mass number of 19

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Answers (2)
  1. 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.
  2. 16 December, 12:40
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    Your answer is potassium
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