<P> The periodic table is a useful tabular arrangement of the chemical elements , ordered by their atomic number , electron configuration , and recurring chemical properties , whose adopted structure shows periodic trends . Generally , within one row ( period ) the elements are metals on the left , and non-metals on the right , with the elements having similar chemical behaviours being placed in the same column . Table rows are commonly called periods and columns are called groups . Six groups have accepted names as well as assigned numbers : for example , group 17 elements are halogens ; and group 18 are noble gases . Also displayed are four simple rectangular areas or blocks associated with some approximately similar chemical properties . </P>
<P> The periodic table is a useful tabular arrangement of the chemical elements , ordered by their atomic number , electron configuration , and recurring chemical properties , whose adopted structure shows periodic trends . Generally , within one row ( period ) the elements are metals on the left , and non-metals on the right , with the elements having similar chemical behaviours being placed in the same column . Table rows are commonly called periods and columns are called groups . Six groups have accepted names as well as assigned numbers : for example , group 17 elements are halogens ; and group 18 are noble gases . Also displayed are four simple rectangular areas or blocks associated with some approximately similar chemical properties . </P>
other names for rows on the periodic table
other names for rows on the periodic table
period
period