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The answer is 'groups', there are 18 main groups and two special ones (with 14 lantanides and 14 actinides respectively).

Groups contain elements with the same 'outer' electron configuration (valence electrons).

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How many collumns in the periodic table?

17+1


What are the collumns in the periodic table of elements called?

Groups, or Families.


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Is a group on the side of periodic table?

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What is the definition of a column in the periodic table of elements?

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What is meant by 'a group' on the periodic table?

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What are vertical rows in the periodic table called?

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