matter & energy

2. a subatomic particle of about the same mass as a proton but without an electric charge
6. elements are arranged in a serious of rows
8. an electron of an atom, located in the outermost shell
9. a substance that takes part in and undergoes change during a reaction
11. a vertical column in the periodic table

1. the positive
3. a stable subatomic particle with a charge of negative electricity
4. the central and most important part of an object,
5. the substances that result from this recombination of atoms
7. It is used to describe where electrons are when they go around the nucleus of an atom
10. the majority of