1. Which of these has a neutral charge?
Protons Neutrons Electrons Quarks None of these

2. How many protons in sodium-23?
11 12 23 1 0

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

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

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

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