17. Which of the following lists contains only elements and a reason why they are
elements
C1...
17. Which of the following lists contains only elements and a reason why they are
elements
C12, H2, Na, He - Substances are elements because they are pure.
H, O, NaCl, N2, CO2-Substances are elements because they
contain more than one chemical symbol
Kr, Ne, Ar, He - Substances are elements because they are all noble
gases.
F3, Os, Li, H-Substances are elements because they all have
chemical symbols.
Answers: 3
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