Across
- 2. The part of the atom with a positive charge
- 8. The most reactive group of metals on the periodic table
- 10. The smallest unit of matter that forms an element
- 11. The heaviest part of an atom
- 13. The least reactive group on the periodic table
- 14. The results of a chemical reaction
- 15. The smallest part of an atom
Down
- 1. An atom that has lost or gained one or more electrons
- 3. Where the protons and neutrons are found in a atom
- 4. Substance used to cause a chemical reaction
- 5. The base unit of amount of a substance as determined by the International System of Units
- 6. Electrons in the outermost shell of an atom
- 7. Elements that have the same atomic number but different number of neutrons
- 9. The study of substances and their behaviors
- 12. A substance composed of two or more chemical elements