Isotopes of an element have the same number of ______ and different numbers of ______.?
neutrons . . . electrons
neutrons . . . protons
electrons . . . protons
protons . . . electrons
Answer:
They have the same number of protons, but different numbers of neutrons. Because neutrons have no charge in the atom structure, there can be more or less of them without making a difference in the atom, except in the mass.
Protons...Neutrons
same # of protons, different of neutrons
To take an example that may help you to remember this, deuterium and tritium are isotopes of hydrogen, differing in that they have 1 and 2 neutons in the nucleus respectively, whereas everyday hydrogen has none. When combined with oxygen, they make heavy water and super-heavy water. All of the hydrogen isotopes have just one proton. So the answer is your first alternative, "protons" and "neutrons".
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