Across
- 4. Horizontal row in the periodic table
- 7. Chemical bond formed by sharing electron pairs between atoms
- 8. An atom that has gained or lost electrons (general term)
- 12. Mass of an atom including protons and neutrons
- 13. Atoms of the same element with different numbers of neutrons
- 16. The force that holds the nucleus together
- 19. Scientist who discovered the neutron (1932)
- 21. Chart that organizes elements by increasing atomic number
- 23. Ability to do work, often discussed in electron transitions and reactions
- 24. Group 18 elements that are very unreactive
- 26. Scientist who performed the gold-foil experiment and found the nucleus
- 28. Vertical column in the periodic table (shared chemical properties)
- 29. Elements that are typically good conductors of heat and electricity
- 30. Neutral particle found in the nucleus
Down
- 1. Process that forms new elements inside stars (stellar element formation)
- 2. Region where electrons are most likely found (quantum region)
- 3. General term for an atom that carries a net electric charge
- 4. Positively charged subatomic particle in the nucleus
- 5. Scientist who proposed the solid-sphere atomic model (early atomic theory)
- 6. The lightest noble gas
- 9. Ancient philosopher often credited with early atomism (named the indivisible particle)
- 10. Number of protons in the nucleus
- 11. Scientist who proposed a planetary model for electrons circling the nucleus
- 14. Element with atomic number 6 (basis of organic chemistry)
- 15. Negatively charged subatomic particle
- 17. Central part of the atom containing protons and neutrons
- 18. A pure substance made of only one kind of atom
- 20. Discrete energy levels where electrons reside around the nucleus
- 22. The first element on the periodic table
- 25. Basic unit of matter
- 27. Scientist who discovered the electron (plum pudding model)