Periodic Table History and Parts - Chemistry - Mrs. Knox

Groups

Columns

Periods

Rows

Main Group Elements

1, 2, 13-18

Properties of Metals

• Left side of the periodic table

• Solid (except mercury)

• Good conductors of heat and electricity

• High luster: shiny

• Malleable: easily shaped/formed

• Ductile: easily drawn into wires

Properties of Nonmetals

• Right side of the periodic table

• Many are gases

• Poor conductors of heat and electricity

• No luster

• Not malleable

• Not ductile

Properties of Metalloids

• Stair step section on periodic table

• Solids

• Have properties of both metals and nonmentals

• Semimetals: conduct heat and electricity, but not as well as metals

John Newlands (1865

Arranged elements according to atomic mass

Dmitiri Mendeleev (1869)

Arranged elements according to properties

Henry Moseley (1913)

Arranged elements according to atomic number

Glenn Seaborg (1941)

Discovered elements 94 and 102. Reconfigured the periodic table by placing the actinide series below the ianthanide series, separate from the d-subshell

Periodic Law

Trends of chemical and physical properties are based on the arrangement of increasing atomic number

Democritus