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

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

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

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

5. When an element has a different number of neutrons, it is called a/an...
Anomaly Differentiated Mutated Isotope None of these

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