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6 November, 06:36

Which is an element

A. h2o

B. NaCl

C. Mg

D. CO

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Answers (1)
  1. 6 November, 10:36
    0
    The answer is C. Mg.

    Mg is a chemical symbol of magnesium. Magnesium is an alkaline earth metal from the second group of periodic systems. Since it is a metal, in an elementary state it does not form an elementary molecule.

    H2O is a chemical formula for a molecule of water.

    NaCl is a chemical formula for a molecule of s odium chloride also known as salt.

    CO is a chemical formula for a molecule of carbon monoxide.
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