Periodic Table Basics

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