Across
- 8. : The distance from the nucleus to the outermost electrons; the size of the atom
- 9. : A negatively charged ion (gains electrons)
- 11. : A measure of how strongly an atom attracts electrons in a bond
- 14. : Elements in Groups 3–12; often form colorful compounds and are good conductors
- 15. : Elements in Group 17; very reactive nonmetals
- 16. : When elements are arranged by increasing atomic number, their properties repeat in a regular pattern
- 17. : Shiny, good conductors of heat and electricity, malleable and ductile
- 18. : Dull, brittle elements that are poor conductors of heat and electricity
- 19. : Elements with properties of both metals and nonmetals
Down
- 1. : Elements in Group 1 of the periodic table; very reactive metals
- 2. : The scientist who created the first periodic table
- 3. : Elements in Group 2; reactive metals but less so than alkali metals
- 4. : Elements in Groups 1, 2, and 13–18; show a wide range of chemical properties
- 5. : Elements in Group 18; unreactive gases because their outer electron shells are full
- 6. : A positively charged ion (loses electrons)
- 7. : An atom or molecule that has gained or lost electrons and has a charge
- 10. : A horizontal row in the periodic table
- 12. : A vertical column in the periodic table; elements in the same group have similar properties
- 13. : The energy needed to remove an electron from an atom