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

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

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

4. Which of these has a neutral charge?
Protons Neutrons Electrons Quarks 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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