Across
- 4. bond between a metal and a metal
- 5. a unit of mass that describes the mass of an atom or a molecule
- 8. a horizontal row of elements in the periodic table
- 11. a substance made up of atoms of two or more different elements joined by chemical bonds
- 12. an element that conducts heat and electricity poorly
- 14. in physical science an atoms central region which is made up of protons and neutrons
- 17. type of metal that is easily combined
- 18. makes up the universe
- 19. a subatomic particle that has no charge and is found in the nucleus of an atom
Down
- 1. an element that is shiny and that conducts heat and electricity well
- 2. bond between a metal and a nonmetal
- 3. number of protons and neutrons in an atom
- 5. the mass of an atom expressed in atomic mass units
- 6. element that have have properties of both metals and nonmetals
- 7. a vertical column of elements in the periodic table
- 9. name for the most important elements
- 10. bond between a nonmetal and a nonmetal
- 13. a subatomic particle that has a negative charge
- 15. a substance that cannot be separated or broken down into simpler substances by chemical means
- 16. a subatomic particle that has a positive charge and that is found in the nucleus of an atom
