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

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

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

4. Which of these can an element have a different number of?
Protons Neutrons Electrons All of these None of these

5. How many significant figures: 26 * 300
Answer:

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