Across
- 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
Down
- 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