Across
- 2. the radiation that starts with a b
- 3. _____ life of an isotope or atom
- 5. The number in the top right corner of an element
- 8. Who said atoms were made of indivisibles
- 9. A positive charged thing in an atom
- 12. the things in the periodic table
Down
- 1. a ray that gives off radiation
- 4. Basic building block of life
- 6. The same element with a different amounts of neutrons
- 7. a negatively charged thing in an atom
- 10. A neutral charged thing in an atom
- 11. The radiation that starts with an a