Atoms and elements
Question
a) An atom is made up of ...
ions, protons, and electrons.
neutrons, electrons, and molecules.
molecules, neutrons, and ions.
electrons, neutrons, and protons.
Question
b) Which of the following substances are all elements?
Carbon dioxide, iron, salt.
Water, air, oxygen.
Iron, sulfur, oxygen.
Air, oxygen, nitrogen.
Question
c) The element carbon has an atomic number of 6. This number refers to ...
the number of protons.
how reactive the atom is.
the number of protons and neutrons.
how heavy an atom of carbon is.
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