Periodic Table

2. Outer-shell electrons that largely determine an element's chemical behavior.
5. A vertical column whose elements have similar chemical properties.
7. Type of element that is typically shiny, malleable, and a good conductor of electricity.
10. The number of protons in an atom's nucleus that identifies the element.
13. Measure of an atom's attraction for shared electrons in a chemical bond.
15. Family of highly reactive Group 1 elements (except hydrogen).

1. The repeating pattern of properties that gives the periodic table its name.
3. A pure substance made of only one type of atom.
4. Highly reactive Group 17 elements that readily form salts with metals.
6. A horizontal row of elements on the periodic table.
8. Atomic property that generally decreases from left to right across a period.
9. Element with properties intermediate between metals and nonmetals.
11. Type of element that generally conducts heat and electricity poorly.
12. Tendency of an element to undergo chemical change.
14. Group 18 elements with filled valence shells and very low chemical reactivity.