Isotopes are atoms that have the same number of protons but different numbers of neutrons.

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Prepare for the Virginia 7th Grade Science SOL Test. Incorporate flashcards and multiple choice questions, each with hints and detailed explanations. Ensure your success on the exam!

Multiple Choice

Isotopes are atoms that have the same number of protons but different numbers of neutrons.

Explanation:
Isotopes are atoms of the same element that differ in the number of neutrons, so they keep the same number of protons but have a different total mass. This means the element stays the same because protons define the element, while neutrons can vary. That description—same protons, different neutrons—fits isotopes perfectly. The other ideas point to something else: changing the number of protons would make a different element; different elements with the same mass aren’t about isotopes; a molecule is simply a group of atoms bonded together, not a description of isotope variation within an element.

Isotopes are atoms of the same element that differ in the number of neutrons, so they keep the same number of protons but have a different total mass. This means the element stays the same because protons define the element, while neutrons can vary. That description—same protons, different neutrons—fits isotopes perfectly. The other ideas point to something else: changing the number of protons would make a different element; different elements with the same mass aren’t about isotopes; a molecule is simply a group of atoms bonded together, not a description of isotope variation within an element.

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