1.What is an isotope? Atoms of the same element with different numbers of ______.

A. electrons B. mass number C. neutrons D. protons

2. Which of the following statements correctly describes the change in a neutral atom

that undergoes as it becomes a cation? The atom_________________.

A. gains a proton and becomes positive

C. loses an electron and becomes positive


B. loses a proton and becomes negative

D. gains an electron and becomes negative​