Across
- 1. the central core of an atom, containing protons and neutrons
- 5. number of protons contained in an atom
- 8. smallest form of matter, which cannot be divided into different pieces
- 9. a combination of different types of atoms, linked by a chemical bond
- 12. specific form of matter, composed of only one type of atom
- 13. form of matter found in conditions of extreme heat
Down
- 2. the smallest significant particle in an atom
- 3. a group of atoms or molecules that total 6.02x10^23
- 4. for of matter with no definite size
- 6. an atom that has lost an electron
- 7. an atom that has gained an electron
- 10. shell, or circular path electrons follow
- 11. a group of two or more atoms, linked by a chemical bond