Across
- 2. table - a chart in which all known elements are listed in order of atomic number
- 5. - a small, discrete packet of light energy
- 6. gas shell - a region of space around the atomic nucleus within which electrons may reside
- 7. - a positively charged subatomic particle in the atomic nucleus
- 9. - any material that is made up of only one type of atom
Down
- 1. - a vertical column in the periodic table; also known as a family of elements
- 2. model - a representation of an object on the same convenient scale
- 3. model - a representation of a system that helps us predict how the system behaves
- 4. - an electrically neutral subatomic particle in the atomic nucleus
- 8. nucleus - the dense, positively charged center of every atom