CPE Unit 3 Vocab (Periodic Table)

periodic law

states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements

period

a horizontal row of elements in the periodic table

group

a vertical column of elements in the periodic table; they share chemical properties

ion

atom that has gained or lost one or more electrons and has a negative or positive charge

metal

element that is shiny and conducts heat and electricity well

nonmetal

element that conducts heat and electricity poorly

semiconductor

element or compound that conducts electric current better than an insulator but not as well as a conductor does

alkali metal

elements in group 1 of the periodic table

alkaline-Earth metal

elements in group 2 of the periodic table

transition metal

one of the metals that can use the inner shell before using the outer shell to bond

noble gas

elements in group 18 of the periodic table

halogen

elements in group 17 of the periodic table