Makes up everything -Can be solid, liquid, or gas
-Is made up of atoms, or tiny particles that are the smallest unit of matter

What would be the best title for her notes?

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

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i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a