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Periodic Table
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Physical Science CH5

Periodic Table

QuestionAnswer
Periodic Table An arrangement of elements in columns, based on a set of properties that repeat from row to row.
Period Each row in the table of elements. As period numbers increase, so do the orbitals for the elements included in that period.
Group Each column on the periodic table. Elements within the same group and similiar properties.
Periodic Law The pattern of repeating properties in the periodic table.
Atomic Mass Unit (amu) One twelfth the mass of a carbon-12 atom.
Metals Elements that are good conductors of electric current and heat.
Transition Metals Elements that form a bridge between the left and right side of the periodic table. They have the ability to form compounds with distinctive colors.
Nonmetals Elements that are poor conductors of heat and electric current.
Metalloids Elements with properties that fall between those of metals and nonmetals.
Valence Electron An electron that is in the highest occupied energy level of an atom.
Alkali Metals Elements in Group 1A of the periodic table. They have a single valence electron and are extremely reactive.
Alkaline Earth Metals Elements in Group 2A of the periodic table. They have two valence electrons and are harder than metals in Group 1A.
Halogens Elements in Group 7A. They have seven valence electrons.
Noble Gas Elements in Group 8A. They have eight valence electrons (except for Helium which has two) and they are colorless, odorless, and extremely unreactive.
Mendeleev's Proposal Arrangment of the elements into rows in order of increasing mass so that elements with similar properties were in the same column.
Mendeleev's Prediction Using the properties of existing elements to predict properties of undiscovered elements.
Created by: brittneymr
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