Across
- 1. Basis of organic chemistry
- 5. Element that donates electrons
- 8. Area where electrons are likely found
- 9. Developed the planetary model
- 12. Most dense region of the atom
- 13. Simplest atom with one proton
- 15. Smallest unit retaining chemical properties
- 16. Two nuclei combine to form a heavier nucleus
- 17. Elements formed during supernovae
- 19. Region of electron probability
- 20. Formation of heavy elements in stars
- 22. Neutral particles in the nucleus
- 27. Electrons orbit in energy levels
- 28. Proposed the nuclear atom model
- 29. Total protons and neutrons
Down
- 2. Number of protons in the nucleus
- 3. Horizontal rows on the periodic table
- 4. Bond formed by sharing electrons
- 6. Unit used to measure atomic mass
- 7. Organizes elements by atomic number
- 10. Proposed the plum-pudding model
- 11. Same protons, different neutrons
- 14. Basic building blocks of matter
- 16. Splitting of a heavy nucleus
- 18. Mixing of atomic orbitals
- 21. Negatively charged subatomic particle
- 23. Particles responsible for chemical reactions
- 24. Vertical columns on the periodic table
- 25. Element that tends to gain electrons
- 26. Positively charged particle in the nucleus