Across
- 2. the smallest unit of an element that maintains the properties of that element
- 4. vertical columns on the periodic table
- 5. horizontal rows on the periodic table
- 7. A tiny, negatively charged particle that moves around the nucleus of an atom
- 8. The total number of protons and neutrons in an atom's nucleus
- 9. A subatomic particle that is neutral and that is found in the nucleus of an atom
Down
- 1. Positively charged particle in the nucleus of an atom
- 3. The number of protons in the nucleus of an atom
- 6. Pure substance that consists entirely of one type of atom