Which term describes two atoms of the same element that have different numbers of neutrons?

• A. Isomers
• B. Allotropes
• C. Isotopes
• D. Ions

Answer: (C)

Verified step by step guidance

1. Understand that atoms of the same element have the same number of protons but can differ in the number of neutrons.
2. Recall that atoms of the same element with different numbers of neutrons are called isotopes.
3. Recognize that isomers refer to molecules with the same molecular formula but different arrangements of atoms, which is unrelated to atomic structure.
4. Know that allotropes are different structural forms of the same element in the same physical state (like oxygen as O2 and O3), not related to neutron number.
5. Identify that ions are atoms or molecules with a net electric charge due to loss or gain of electrons, which does not involve neutron number differences.