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Preview questions
1. What is the smallest unit of an element?
Molecule · Atom · Compound · Ion
2. Which of the following represents a molecule?
Na · O2 · Cl · He
3. What is the chemical formula for water?
H2O · CO2 · O2 · H2O2
4. Which of the following is a compound?
O2 · N2 · HCl · Ar
5. How many atoms are present in a molecule of glucose (C6H12O6)?
6 · 12 · 24 · 18
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