Periodic Table Terms Crossword Puzzle

QUESTIONS LIST:

• periodic law : properties of elements vary in a repeating pattern when arranged by atomic number.
• periodic table : chart of elements arranged by atomic number showing recurring patterns in properties.
• family : a column of elements with similar structures and chemical behavior.
• group : another word for a family; vertical column on the periodic table.
• valence electron : an electron in the outermost energy level that participates in bonding.
• period : a horizontal row on the periodic table representing energy levels.
• metal : element that is dense, conductive, lustrous, and typically reactive with few valence electrons.
• metalloid : element with mixed properties of metals and nonmetals; often a semiconductor.
• nonmetal : element with four or more valence electrons, usually a gas or brittle solid, and poorly conductive.
• alkali metal : group 1 element with one valence electron that is highly reactive.
• earth metal : alkaline _ - group 2 element with two valence electrons, forming 2+ cations.
• transition metal : group 3–12 element with variable valence electrons and stable compound formation.
• inner : _ transition metal - lanthanide or actinide element, usually rare or radioactive.
• mixed group : elements in groups 13–16 including metals, nonmetals, and metalloids.
• halogen : group 17 element with seven valence electrons that readily gains one to form −1 ions.
• noble gas : group 18 element with a full outer energy level and very low reactivity.
• atomic radius : distance from the nucleus to the outermost electrons of an atom.
• electronegativity : measure of an element’s ability to attract and hold electrons when bonded.