posted by Anonymous .
What are the 4 categories included in the Periodic Table?
There are many ways to categorize elements. I am uncertain how you got just four.
The Originator of the four concepts did it this way...
Maybe your teacher is looking for these four: Nonmetals, metals, noble gases, and rare earths. Or nonmetals, metals, noble gases, and metalloids.
Do you know the group numbers of the periodic table or know a site that does?
Go to www.webelements.com amd click on the pro version.
Do you guys have a poem for group 17 of the periodic table