Across
- 6. The number of protons in an atom
- 7. An atom of an element that has an electric charge
- 8. The mass of an atom; equal to protons plus neutrons
- 9. The electrons found in the outermost shell
- 10. The name of the element
Down
- 1. A string of element symbols that tell what a molecule is made of
- 2. A group of two or more elements bonded together
- 3. The letter or pair of letters that stand(s) for an element
- 4. Made up of only one type of atom
- 5. The smallest particle of any element that retains the properties of the element