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9 - Module 4 TEST

TermDefinition
alkali metals elements in group 1 of the periodic table; they are the most reactive; their atoms have one electron in their outer level
alkaline earth metals the elements in Group 2 of the periodic table; they are reactive metals but are less reactive than alkali metals; their atoms have two electrons in their out level
atomic mass unit a mass equal to ; one-twelfth the mass of an atom of carbon-12.
element one type of atom; a substance composed of atoms having an identical number of protons in each nucleus
Group 1 alkali metals
Group 2 Alkaline Earth Metals
Group 3-12 transition metals
Group 13 (3A) Boron Group
Group 14 (4A) Carbon Group
Group 15 (5A) Nitrogen Group
Group 16 (6A) Oxygen Group
Group 17 (7A) Halogens
Group 18 (8A) Nobel gases
group a column in the periodic table of elements. Sometimes referred to as a family
halogens the elements in group 17 of the periodic table; they are very reactive nonmetals, and their atoms have seven electrons in their outer level
metalloids elements with properties that fall between those of metals and nonmetals
metals elements that are good conductors of electric current and heat
noble gases the unreactive elements in group 18 of the periodic table; their atoms have eight electrons in their outer level (except helium, which has two electrons)
nonmetals Elements that are poor conductors of heat and electric current
period a sequence of elements arranged in order of increasing atomic number and forming one of the horizontal rows in the periodic table
periodic law the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements
periodic table a table in which the elements are organized 4
transition metals elements that form a bridge between elements on the left and right sides of the periodic table
valence electron an electron in the highest occupied energy level of an atom
Created by: Ms. Greenup
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