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

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

3. Which of these is not an element?
Uranium Plutonium Iron Gold Brass

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

5. How many neutrons in carbon-13?
13 0 1 7 6

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