Question

question 12. which phrase describes two atoms that contain the same number of protons but a different number of neutrons? ions of the same element. isotopes of the same element. a mixture of different elements. nuclides of different elements.

Explanation:

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. Ions are atoms with a charge due to loss or gain of electrons. A mixture of different elements consists of distinct elements. Nuclides of different elements have different numbers of protons.

Answer:

B. Isotopes of the same element.