Across
- 1. vertical column in the periodic table
- 5. mass of an element's atoms; listed in the periodic table as an average value based on the relative abundance of the element's isotopes.
- 8. member of a set of atoms of the same element whose nuclei contains the same number of protons but different numbers of neutrons.
- 9. abbreviation for an element or atom.
- 10. subatomic particle found in the atomic nucleus.
Down
- 2. a representation of an object on some convenient scale.
- 3. small, discrete packet of light energy.
- 4. positively charged subatomic particle in the atomic nucleus.
- 6. device that uses a prism or diffraction grating to separate light.
- 7. any material that is made up of only one type of atom.