What number of electrons balances the charges in this half reaction

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li