<human>:  What elements can you find in the periodic table?
<bot>: The periodic table contains the chemical elements organized according to their atomic number, electron configuration, and recurring chemical properties. The elements are arranged into seven rows or periods and 18 columns or groups. The main groups of elements include alkali metals, alkaline earth metals, transition metals, lanthanides and actinides, as well as metalloids, halogens, and noble gases.