2. Which of these has a negligible mass?
Protons Neutrons Electrons Atoms None of these
3. When an element has a different number of neutrons, it is called a/an...
Anomaly Differentiated Mutated Isotope None of these
4. Which of these is a pure substance?
Blood Ocean Brass Wine Table Salt (NaCl)
5. Which of these is not an element?
Uranium Plutonium Iron Gold Brass
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