Across
- 2. vertical column in the periodic table; also known as a family elements
- 4. positively charged subatomic particle in the atomic nucleus
- 5. member of a set of atoms of the same element whose nuclei contain the same number of protons
- 6. any material that is made up of only one type of atom
- 8. a representation of an object on some convenient scale
- 9. electrically neutral subatomic particle in the atomic nucleus
- 10. horizontal row in the periodic table
Down
- 1. small, discrete packet of light energy
- 3. a device that uses a prism or diffraction grating to separate light into its color components
- 7. extremely small, negatively charged subatomic particle