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

2. Which of these is a pure substance?
Blood Ocean Brass Wine Table Salt (NaCl)

3. How many significant figures: 1.003080
Answer:

4. How many significant figures: 26.2 + 100.
Answer:

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

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