Across
- 4. Neutral particle inside the nucleus
- 10. Measure of an atom’s ability to attract electrons
- 12. Combining light nuclei to form heavier ones
- 13. Total number of protons and neutrons
- 14. Energy level where electrons reside
- 15. Splitting a heavy nucleus into smaller nuclei
- 17. Number of protons in an atom
- 21. Region where electrons are most likely to be found
- 25. Reactive metal found in group 1
- 26. Radioactive metal series beginning with actinium
- 27. Formation of new elements in stars or labs
- 28. Emitting particles or energy due to unstable nuclei
- 29. Positively charged particle in the nucleus
- 30. Rare-earth metal in period 6
Down
- 1. Scientist who proposed quantized electron orbits
- 2. Atoms of the same element with different neutron counts
- 3. Negatively charged particle orbiting the nucleus
- 5. Metallic elements in the center of the periodic table
- 6. Element with both metal and nonmetal properties
- 7. Negatively charged ion
- 8. Positively charged ion
- 9. Smallest unit of matter
- 11. Vertical column in the periodic table
- 16. Chemically inert element in group 18
- 18. Dense central core of the atom
- 19. Unstable isotope that undergoes decay
- 20. Highly reactive nonmetal in group 17
- 22. Atom that has gained or lost electrons
- 23. Horizontal row in the periodic table
- 24. Electrons involved in chemical bonding