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. How many protons in sodium-23? 11 12 23 1 0
5. Which of these is not an element? Uranium Plutonium Iron Gold Brass
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