Across
- 2. My atomic mass is 35.453 (use the periodic table to help you)
- 3. I have 26 protons (use the periodic table to help you)
- 5. I am a gas with a mass number of 19 (use the periodic table to help you)
- 7. The number of _____________ equals the atomic number
- 8. First developed the periodic table (last name)
Down
- 1. the mass of protons and neutrons in an atom
- 4. In the periodic table, this describes atoms with similar properties
- 6. Scientist who developed the “plum pudding model”