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

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

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

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

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

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