Across
- 4. poor conductors of heat and electricity
- 5. mass that is concentrated in a tiny central core
- 7. characterized as being shiny, opaque, and good conductors of electricity and heat
- 8. horizontal row in the periodic table
- 9. positively charged subaomic particles
- 11. letters of a name associated with that element
- 12. vertical row in the peroidic table
- 13. Planck identified each discrete parcel of light energy
Down
- 1. have no electric charge
- 2. a chemical element that has properties intermediate between those of metals and nonmetals
- 3. any material consisting of only one type of atom
- 6. new materials are formed by a changein the way atoms are bonded together
- 10. comes from the Greek word for amber