2. How many protons in sodium-23?
11 12 23 1 0
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 neutrons in carbon-13?
13 0 1 7 6
5. Which of these is not an element?
Uranium Plutonium Iron Gold Brass
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