Across
- 3. liquid, gas, or solid
- 7. a stable subatomic particle with a charge of negative electricity
- 8. hard but liable to break or shatter easily
- 9. mass the quantity of matter contained in an atom of an element
- 10. the center part of an atom
Down
- 1. a stable subatomic particle
- 2. a subatomic particle of about the same mass as a proton
- 4. a group of atoms bonded together
- 5. table a table of the chemical elements arranged in order of atomic number
- 6. number the number of a chemical element in the periodic system