a family of the Periodic Table is like a group of elements of the same type.
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A family is a column in a periodic table; all elements in a family have similar physical and chemical properties, because they have the same numbers of valence electrons (outer electrons).
noble gases
In chemistry, a group (also known as a family) is a vertical column in the periodic table of the chemical elements. There are 18 groups in the standard periodic table.
Those Roman numerals on the periodic table refer to the number of valence electrons in a given group.
Is the periodic table used for Math teachers?