It should be....Brandon is visiting his grandmother next week; he can't march in the parade.
Isotopes are atoms with the same number of protons and different number of neutrons. There are two different types of Ions. A "Cation: is an atoms that has lost one or more electrons and an "Anion" is an atoms that has gained one or more electrons.
A rule is a statement that tells what is and what is not allowed in a certain situation or context.
May I drive your car to the dance tonight. Your= someones possession "your cellphone" "YOUR laptop"
you're= you are " You're (you are) a Capricorn, right?"
An easy way to figure this out is to say you are in the sentence and listen to see if it makes sense