Across
- 3. particle that stabilizes the nucleus
- 5. (15)
- 7. column in the periodic table
- 8. of creating heavier elements in stars
- 10. decay where a neutron becomes a proton
- 12. electron involved in bonding
- 13. charged particle in the nucleus
- 18. (15)
- 20. 18 elements known for low reactivity
- 21. charged ion
- 23. that has gained or lost electrons
- 26. formed when atoms bond chemically
- 27. who proposed the first modern atomic theory
- 30. of nuclear decay releasing a helium nucleus
- 31. property of particles (positive, negative, neutral)
- 32. model proposing electrons orbit in energy levels
Down
- 1. row in the periodic table
- 2. region where electrons move around the nucleus
- 4. part of the atom containing protons and neutrons
- 6. unit of matter that retains chemical properties
- 9. easily an atom undergoes chemical change
- 11. of elements by atomic number
- 14. charged particle found outside the nucleus
- 15. that is shiny, malleable, and conducts electricity
- 16. of how strongly an atom attracts electrons
- 17. of the same element with different numbers of neutrons
- 19. of protons and neutrons in an atom
- 22. of protons in an atom
- 24. charged ion
- 25. process that forms heavier elements in stars
- 28. substance made of one type of atom
- 29. where electrons are likely to be found