Answer: the atoms of those isotopes have the same atomic number (number of protons), making them belong to the same ele- ment, but they have different mass numbers (total number of protons and neutrons) giving them differ- ent atomic masses.
Explanation:
Answer:
Three atoms of magnesium can have different masses because each of the three atoms has a different number of neurons.
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C
Beryllium, because it is in period 2 and has four total electrons.
The charge would be -1.
Answer: the answer is b
because why not
