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

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

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

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

5. Which of these is a mixture?
Uranium Table Salt (NaCl) Iron Steel Water

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