Across
- 3. The smallest particle that still can be considered an element.
- 5. The number of protons in the nucleus of an atom.
- 7. This person called a positively-charged particle in an atoms nucleus a proton.
- 8. The dense center of an atom.
- 9. An isotope is identified by this.
- 10. A chart showing all of the elements arranged according to the repeating pattern of their properties.
Down
- 1. Chadwick showed that another particle exists inside the nucleus of atoms.
- 2. The average mass of all the isotopes of that element
- 4. A one-or two-letter abbreviation for the element.
- 6. Discovered a set of patterns that applies to all the elements.