The periodic table is an arrangement of the elements in order of increasing atomic number. The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the...The periodic table is an arrangement of the elements in order of increasing atomic number. The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the basis of their chemical properties. Elements that exhibit similar chemistry appear in vertical columns called groups (numbered 1–18 from left to right); the seven horizontal rows are called periods.
The periodic table is an arrangement of the elements in order of increasing atomic number. The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the...The periodic table is an arrangement of the elements in order of increasing atomic number. The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the basis of their chemical properties. Elements that exhibit similar chemistry appear in vertical columns called groups (numbered 1–18 from left to right); the seven horizontal rows are called periods.