Across
- 3. - An element in Group 2 of the periodic table, having two valence electrons that it tends
- 8. - The law states that the elements' properties vary with their atomic numbers in a regular, repeated pattern.
- 9. - An element that typically has four or more valence electrons and that does not exhibit the general properties of metals; located on the right side of the periodic table.
- 11. - A table of the chemical elements arranged to display their periodic properties in relation to their atomic numbers.
- 12. - An element in Group 18 on the periodic table has eight valence electrons that fill the outer energy level. (Helium is an exception with only two.) As a whole, the outer energy level is inert (i.e., nonreactive).
Down
- 1. - An element in Group 1 of the periodic table, having one valence electron that it can quickly lose to form a 1 + cation, making it highly reactive; the most reactive of all the metals.
- 2. - Any elements in Groups 3–12 of the periodic table, typically having one or two valence electrons, which it quickly loses, resulting in cations with charges of 1 + or 2 +.
- 4. - Any electron in the outermost energy level of a neutral atom. Unpaired valence electrons are usually involved in chemical bonding.
- 5. lose quickly to become a 2 + cation, making it very reactive.
- 6. - Any of Groups 13–16 in the periodic table; so named because they contain metals, nonmetals, and metalloids. These groups are often named for the first element in the family.
- 7. - An element typically dense, solid, ductile, malleable, highly conductive, and chemically reactive, especially in nonmetal elements. Metals are located on the left end of the periodic table.
- 10. - An element with characteristics between metals and nonmetals, also called semiconductors, located between metals and nonmetals on the periodic table.