Across
- 5. An extremely small, negatively charged subatomic particle found in a cloud outside the atomic nucleus
- 6. An abbreviation for an element or atom
- 8. A vertical column in the periodic table; also known as the family of elements
- 9. Any material that is made up of only one type of atom
- 10. A positively charged subatomic particle in the atomic nucleus
Down
- 1. Any member of a set of atoms of the same element whose nuclei contain the same number of protons but different numbers of neutrons
- 2. An electrically neutral subatomic particle in the atomic nucleus
- 3. A chart in which all known elements are listed in order of atomic number
- 4. A count of the number of protons in the atomic nucleus
- 7. Horizontal row on the periodic table