Across
- 2. What emits helium nuclei?
- 5. Which subatomic particle has a neutral charge?
- 7. An ion with a positive charge
- 8. What is the p orbital called?
- 11. What subatomic particle is massless?
- 12. Who had the plum pudding model?
- 15. Who arranged the periodic table in order of increasing atomic mass?
- 17. The total number of protons and neutrons in the nucleus of an atom
- 20. A region of space in which there is a high probability of finding an electron?
Down
- 1. The attractive force that holds the nucleus together
- 3. What borders the stair-step line between metals and nonmetals?
- 4. What did Goldstein discover?
- 6. A wave's height from zero to crest
- 9. The way electrons are arranged in various orbitals around the nucleus of an atom
- 10. Who used the scientific method to revise Democritus's model?
- 13. Who arranged the periodic table in order of increasing atomic number?
- 14. Who proposed that atoms were indestructible and indivisible?
- 16. Characterized by the presence of electrons in d orbitals
- 18. Who discovered the neutron?
- 19. What is the most electronegative element on the periodic table?