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1. Which of these has a negligible mass?
Protons Neutrons Electrons Atoms None of these

2. How many electrons in boron-11?
11 5 6 10 None of these

3. Which of these has 23 protons?
Scandium Titanium Vanadium Chromium None of these

4. Convert 23mmHg to atm.
0.03026 0.303 0.030 None of these All of these

5. Which of these has a negative charge?
Protons Neutrons Electrons Quarks None of these

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