Simple Description

A table of all of the known elements

Further Detail

The Periodic Table lists elements in order of proton number. The vertical columns are called groups and each group contains elements that show similar properties; for example, the elements in group 1 (sodium, lithium, potassium etc) are all metal, have low densities and are easy to cut with a knife. The group number also tells you how many electrons are in the outer shell of that element. The horizontal rows are called periods, each periodl has the same number of electrons shells.

Related Words:

• Atom
• Element

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