Across
- 2. is usually a shiny solid
- 6. electron outermost energy level of an atom
- 7. arrangement of chemical elements by atomic number
- 9. deterioration of metals caused by the action of air
- 11. a mixture container 2 or more metallic elements
Down
- 1. susceptibility to chemical change
- 3. particle with negative charge
- 4. smallest component of an element
- 5. positive charge
- 8. chemically gaseous element helium group
- 10. has the same atomic number, different number of neutrons