Across
- 4. Elements that do not easily react
- 5. Scientist who proposed that electrons move in orbits
- 9. Particles found in the nucleus
- 13. Table organizing elements
- 15. Atoms with different neutron numbers
- 16. Space where electrons are found
- 18. Elements created artificially in labs
- 21. Protons have this type of charge
- 22. Positively charged particle
- 24. Each element has a unique _ number
- 25. Total protons + neutrons
- 26. Organized elements by atomic number (scientist)
- 27. Center of the atom
- 28. Atoms of the same element bonded together (ex: O₂)
Down
- 1. Energy level around nucleus
- 2. Horizontal rows in periodic table
- 3. Combination of two or more atoms
- 6. Vertical columns in periodic table
- 7. Process of creating new elements in stars
- 8. Negatively charged ion
- 10. Smallest particle of a compound
- 11. Neutral particle in an atom
- 12. Number of protons in an atom
- 14. Smallest unit of matter
- 17. Particles orbiting nucleus
- 19. Negatively charged particle
- 20. Discovered the electron
- 23. Tiny solid sphere model scientist (last name)