Across
- 3. combinations of two or more elements
- 4. variants of a particular chemical element
- 6. total mass of protons, neutrons, and electrons in a single atom
- 10. is a charged species (ion) composed of two or more atoms covalently bonded
- 11. is a negatively charge paricle
- 13. mass per unit volume
- 16. a material with a definite chemical composition
- 17. particle with no charge
- 18. anything that has mass or volume
Down
- 1. electron that is associated with an atom
- 2. positively charge particle
- 5. number of protons
- 7. type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.
- 8. chemical bond that involves the sharing of pairs of electrons between atoms
- 9. material system made up of two or more different substances
- 12. the center of element
- 14. a pure substance consisting of one type of atom
- 15. an atom or molecule in which the total number of electrons is not equal to the total number of protons