Across
- 1. the electrons moving outside the nucleous with negative charge
- 4. less reactive than most metals
- 6. determined by number of protons
- 8. the horizontal row in the periodic table
- 11. chemical reaction that forms salt when reacts with metal
- 15. characteristic of copper/ metals
- 16. element that conducts electricity and heat
- 17. emitting radiation spontaneously
- 20. negatively charged particles
- 22. atoms with different number of neutrons
- 23. highly reactive electropositive
- 24. almost never reactive
Down
- 2. spontaneous transformation of one element into another
- 3. radioactive
- 5. positively charged particles
- 7. excess of negative charge
- 9. most are gases and dull surfaces
- 10. highly metallic and good conductors of electricity
- 12. the average mass of all the elements isotopes
- 13. neutral charge
- 14. has more protons than electrons
- 18. found in the center of the atom
- 19. vertical columns in the periodic table
- 21. rare Earth metals
- 22. is formed when looses or gains an electron