By grouping the elements according to atomic structure, the Periodic Table indicates which elements are likely to have similar properties, or similar reactions with other elements and compounds. The three subdivisions of the Table are :
Groups : The vertical columns include elements with similar chemical properties e.g. alkali metals.
Periods : The horizontal rows include elements with the same number of electron shells (energy levels).
Blocks : Adjacent groups of elements where the same subshell contains the last electron.
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