The elements on the periodic table are arranged in periods and groups. Periods are the rows running horizontally across the table, and groups are the columns running vertically. In general, elements in the same group have similar properties, while elements in the same period have the same number of electron shells. The arrangement of elements in the periodic table is based on their atomic number, which represents the number of protons in the nucleus of an atom. It is not arranged in alphabetical order or by their weight.
