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“Organizing is what you do before you do something, so that when you do it, it is not all mixed up."

-AA Milne

How is the Modern Periodic Table Organized?

The common modern periodic table is organized by atomic number (thanks, Mosley!).

From there we classify metals vs. non-metals (and metalloids) and group elements into Families like Alkali Metals, Halogens, and Noble Gases.

Groups vs. Periods

Metals vs. Non-Metals

The first big grouping within the modern Periodic Table is whether an element is a metal, non-metal, or metalloid (semi-metal).

PTable Courtesy of the University of Georgia

http://hyperphysics.phy-astr.gsu.edu/hbase/pertab/metal.html#c1

Metals

Non-Metals

Physical Properties:

  • Good conductors of electricity and heat
  • Solid at room temperature (Except Hg)
  • Malleable and ductile (easily formed into shapes)
  • Lusterous (shiny, shiny, shiny)

Physical Properties:

  • Poor conductors of electricity and heat
  • Solid, Liquid or Gasat room temperature
  • Solids are brittle when smacked (generally)
  • Kind of dull, though can be colorful!

Chemical Properties:

  • Tend to have 1, 2, or 3 valence electrons (said it before, will say it again - for Main Group elements the number of valence electrons matches the Group A number!)
  • Quick (and happy) to give up valence electrons to form CATIONS

http://www.chem4kids.com/files/elem_metal.html

Chemical Properties:

  • Tend to have 4-8 valence electrons (check it out, Group A number = number of valence electrons for Main Group elements. Good thing to remember.)
  • Highly motivated to gain valence electrons to form ANIONS or share them to bond covalently

 

 

Groups/Families

Periodic Table Families

Elements in the same Group or Family tend to have the same general characteristics. These are the Groups you need to know:

Here are some other links to help you get aquainted with all the Groups/Families:

How much do you need to know about the Periodic Table is Organized?