Across
- 2. - an elementary particle
- 3. - atoms with some number of protons but different numbers of neutrons.
- 5. - the structure in a cell that contains the chromosomes
- 8. - thorium is a soft, silvery-white metal, solid at room temperature.
- 9. - everything is made of it
- 11. - Every column on the periodic table
- 12. - a solid material that is typically hard
- 14. number - the number of a chemical element in the periodic system.
- 15. - is a radioactive metal, silver in color.
Down
- 1. table - every element is on it
- 4. - a negatively charged subatomic particle
- 5. - Same mass as a proton
- 6. - Uranium has the highest atomic weight of all naturally occurring elements
- 7. - if all of the existing gold in the world was pulled into a 5-micron thick wire, it could wrap around the world 11.2 million times.
- 9. mass unit - 1/12 the mass of a carbon - 12 atom
- 10. lawrencium can be turned into both, gaseous and aqueous phases.
- 13. mass - the quantity of matter contained in an atom of an element