The Mass of Atoms Quiz
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5 questions, one answer each
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1. What is the relative mass of a neutron?
- A. 0
- B. 1
- C. -1
- D. Very small
2. Which particle has a relative mass described as 'very small'?
- A. Proton
- B. Neutron
- C. Electron
- D. Nucleus
3. Which isotope is relative atomic mass compared against?
- A. Hydrogen-1
- B. Oxygen-16
- C. Carbon-12
- D. Carbon-14
4. Why does chlorine have a relative atomic mass of 35.5 rather than a whole number?
- A. Because chlorine atoms lose mass when they react
- B. Because Ar is an average across chlorine's isotopes
- C. Because electrons add fractional mass
- D. Because the mass number of chlorine is 35.5
5. An element has two isotopes: 90% of its atoms have mass number 20, and 10% have mass number 22. Which value is closest to its relative atomic mass?
- A. 20.0
- B. 20.2
- C. 21.0
- D. 22.0