Across
- 2. An element in Group 17 of the periodic table having seven valence electrons. It easily gains an electron, forming a 1- anion, which causes it to be highly reactive.
- 5. An element in Group 18 on the periodic table having eight valence electrons that fill the outer energy level. (Helium is an exception with only two.) With a full outer energy level, it is inert (i.e., nonreactive).
- 6. See family.
- 7. An element with characteristics between those of metals and nonmetals; also called semiconductors; located between metals and nonmetals on the periodic table.
- 9. A measure of an element’s ability to attract and hold electrons when bonded to other atoms.
- 10. 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.
- 14. An element that is typically dense, solid, ductile, malleable, highly conductive, and chemically reactive, especially in the presence of nonmetal elements. Metals are located on the left end of the periodic table.
- 15. A representation of an atom consisting of its chemical symbol with surrounding dots representing its valence electrons.
- 16. 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.
- 17. (1) A row in the periodic table of the elements; also called a series. (2) The time interval (T) for one complete cycle of periodic motion.
- 18. A column of elements in the periodic table having similar valence electron arrangement, resulting in similar chemical properties; also known as a group.
- 19. Any elements in Groups of 3-12 of the periodic table, typically having one or two valence electrons, which it easily loses, resulting in cations with charges of 1+ or 2+.
Down
- 1. An element in Group 2 of the periodic table, having two valence electrons that it tends to lose easily to become 2+ cation, making it very reactive.
- 3. Any electron in the outermost energy level of a neutral atom. Unpaired valence electrons are usually involved in chemical bonding.
- 4. A table of the chemical elements arranged to display their periodic properties in relation to their atomic numbers.
- 8. The distance from the center of an atom’s nucleus to its outermost energy level.
- 11. An element from either of two rows usually placed below the periodic table; a member of either the lanthanide or actinide series. It typically has two valence electrons.
- 12. An element in Group 1 of the periodic table, having one valence electron that it can easily lose to form a 1+ cation, making it extremely reactive; the most reactive of all the metals.
- 13. The law that states that the properties of the elements vary with their atomic numbers in a regular, repeated pattern.