Question

question 9. d. the atom is a negatively - charged isotope. question 10. use the drop - down menus to compare atoms, ions, and isotopes. atoms vary based on their number of protons, ions vary based on their number of electrons, vary based on their number of (select). question 11. oxygen, and three oxygen isotopes are shown. atomic number 8 o

Explanation:

Atoms are distinguished by their number of protons, which determines the element. Ions are atoms that have gained or lost electrons, thus their charge and properties vary based on electron - number. Isotopes of an element have the same number of protons but different numbers of neutrons.

Answer:

Atoms vary based on their number of protons, ions vary based on their number of electrons, isotopes vary based on their number of neutrons.