Across
- 2. Developed the concept of the atom
- 5. A substance in the periodic table is called this
- 6. All matter is made up of atoms
- 7. How many protons are in the nucleus of an atom
- 10. The mass of an atom
- 11. The basic unit of a chemical element
- 13. Subatomic particle with a neutral charge
- 14. An atom or molecule with a net electric charge
- 15. shows what something looks like in a 3D form
Down
- 1. Plum pudding model
- 3. Subatomic particle with a negative charge
- 4. Table of elements arranged in order of atomic number
- 8. Created the first quantum theory atom
- 9. Subatomic particle with a positive charge
- 12. Introduced the atomic theory in chemistry