Across
- 2. average mass of all the isotopes of that element
- 5. flourine, bromine, chlorine and iodine. very reactive
- 6. very center of the atom
- 7. particle that has no charge
- 8. have some properties of metals and some of nonmetals
- 9. anything that hass mass and volume
- 10. where the electrons of an atom are located
- 12. particle that is negatively charged
- 13. term for the rows of the periodic table
- 14. elements of group 18
- 17. elements that are good conductors of electricity
- 19. mostly found on the right side of periodic table
Down
- 1. arrangement of elements showing a repeating pattern
- 3. these metals are harder and denser and melt at higher temperatures
- 4. the outermost electrons
- 11. most reactive elements
- 13. particles that is positively charged
- 15. number of protons inside the nucleus of an atom
- 16. the bulding blocks of matter
- 18. term for columns of the periodic table