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Periodic Table Basics
Organization of the Periodic Table
15
Chemistry
11th Grade
10/12/2009

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Term
Group A Elements
Definition
Elements in groups 1-2 & 13-18 called 'Representative Elements'; they represent a wide range of physical & chemical properties
Term
Nonmetals
Definition
Hydrogen and elements to the right of the 'staircase'; dull, rigid, nonconductive, solids, liquids, and gases
Term
Metals
Definition
Elements to the left of the 'staircase'; app. 80% of all elements; shiny, flexible, conductive, mostly solids
Term
Group (or family)
Definition
Columns of elements with similar physical & chemical properties
Term
Period (or series)
Definition
Rows of elements arranged by increasing atomic number
Term
Dmitri Mendeleev
Definition
'Father of the Periodic Table'; arranged elements by increasing mass & similar properties; correctly predicted properties of unknown elements
Term
Henry Moseley
Definition
Arranged elements by increasing nuclear charge (atomic #) & similar properties; created the modern periodic table
Term
Periodic Law
Definition
There is a periodic repetition of physical & chemical properties when elements are arranged by increasing atomic #
Term
Alkali Metals
Definition
Elements in Group 1 (except for Hydrogen)
Term
Alkaline Earth Metals
Definition
Elements in Group 2
Term
Transition Metals
Definition
Elements in groups 3-12
Term
Halogens
Definition
Elements in Group 17
Term
Noble Gases
Definition
Elements in Group 18
Term
Inner Transition Metals (or 'Rare Earth' Metals)
Definition
Elements #57-70 and #89-102
Term
Metalloids
Definition
Elements along the dividing line between metals & nonmetals with properties of both types of elements
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