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

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

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

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

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


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