Question

1. which statement describes the atoms of the same element that have different masses?

they are isotopes.
they are in an excited state.
they are ions.
they are isobars.
clear all

Explanation:

To solve this, we analyze each option:

• Isotopes: Atoms of the same element with different mass numbers (due to different neutron numbers), so different masses. This matches the description.
• Excited state: Relates to electron energy levels, not mass difference of same - element atoms.
• Ions: Atoms with a charge (gained/lost electrons), not about mass difference of same - element atoms.
• Isobars: Atoms of different elements with the same mass number, not same element.

Answer:

A. They are isotopes.