Across
- 5. -the second row of inner transition elements; radioactive and unstable
- 9. -elements of group 18; exist as isolated atoms; most stable elements
- 10. -element that is shiny, malleable, ductile, and a good conductor of heat and electricity
- 12. -elements of group 2; similar to the alkali metals; some used to color fireworks
- 13. -element that shares some properties with metals and some with nonmetals
- 15. -elements of group 17; very reactive
- 16. -first row of the inner transition elements; used in movie lighting
- 17. -organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties
- 18. -vertical column in the periodic table
- 19. -different molecular structures of the same element
- 20. -a molecule that consists of two atoms of the same element, joined by a covalent bond
Down
- 1. -property of metals and alloys that allows them to be hammered or rolled into thin sheets
- 2. -element that usually is a gas or brittle solid at room temperature, is not malleable or ductile, is a poor conductor of heat and electricity, typically not shiny
- 3. -element, such as radium, whose nucleus breaks down and emits particles and energy
- 4. -horizontal row in the periodic table
- 6. -occurs because some electrons move freely among a metal's positively charged ions
- 7. -elements of group 1; shiny, malleable, ductile, softer than most metals; most reactive
- 8. -elements in groups 3 through 12 of the periodic table; occur in nature as uncombined elements and include the iron triad and coinage metals
- 11. -material that conducts an electric current under certain conditions
- 14. -property of metals and alloys that allows them to be drawn into wires