Across
- 3. nonmetal+nonmetal; shares electrons
- 4. substances that exist before the reaction
- 6. contains one atom
- 7. metal+nonmetal; atoms transfer electrons
- 9. a negative atom; nonmetal
- 10. produced by the reactants
- 12. ___ energy is necessary to remove an electron from a neutral atom
- 17. blocks the effect of the nucleus on the outside layers of electrons
- 19. also known as columns or families of the periodic table
- 22. energy that is absorbed; reactant side
- 23. a measure of the tendency of an atom to attract electrons
- 24. has the electron configuration of 1s^22s^22p^4
Down
- 1. prefix for nine
- 2. metal+metal; includes delocalized electrons
- 5. a positive atom; normally metal
- 8. H, N, O, F, Cl, and I are the six ___ atoms
- 11. the release of heat or energy; on the product side
- 13. created first periodic table; ordered them based on mass
- 14. smallest unit of matter
- 15. the rows of the periodic table
- 16. stands for valence shell electron pair repulsion theory
- 18. anything that has mass and takes up space
- 20. arranged elements by atomic number
- 21. contains more than one type of element