Across
- 2. Gold is an example of an ____________
- 5. rays and particles emitted by the radioactive material
- 7. lowest energy state of an atom
- 9. elements in group 7A which are highly reactive
- 12. the number of protons in an atoms is the __________
- 13. has both physical and chemical properties of metals and nonmetals
- 15. nonreactive group 8A
- 16. minimum amount of energy that can be gained or lost by an atom
- 17. NaCl is an example of a ____________
- 19. homogeneous also referred as
Down
- 1. all moving particles have wave characteristics
- 3. combination of two or more pure substances
- 4. has a constant composition
- 6. usually gases or brittle, poor conductor of heat
- 8. has its own definite shape and volume
- 10. the smallest particle of an element that retains the properties of an element is ____________
- 11. number of waves that pass a given point per second
- 13. elements that are shiny, solid at room temperature, malleable
- 14. negatively charged particles surrounding the nucleus
- 18. same number of protons but different number of neutrons