The Periodic Table

Each element listed on the periodic table includes the atomic number of the element, the element symbol, and the atomic mass.

The atomic number shows how many protons are present in the atom, the element symbol indicates a certain element, and the atomic mass represents the average mass of one atom of the element's atomic mass units. Each atom has a different number of neurons, so isotopes are the different possible versions of each elements depending on the number of neurons each atom has. The presence of different isotopes is the reason why the atomic mass represents the average mass of one atom of the element's atomic mass units.
The periodic table is grouped into several columns. Columns that go from up to down are groups; elements in a group have an equal number of electrons in their outer orbital. Elements in the same column are very similar and part of the same family. Additionally, the elements that are in the same family have similar reactive qualities. The categories of elements included in the periodic table are: Alkali Metals, Alkaline Earth Metals, Inner Transition Metals, Lanthanides, Actinides, Transition Metals, Post-Transition metals, Metalloids, and Nonmetals, such as Halogens and Noble Gases.
The atomic number color shows if an element is a solid, liquid, gas, or unknown.
Rows, or periods, go from left to right. The elements in the same period have the same number of atomic orbitals.
Because elements of the same groups possess similar qualities, and elements of the same rows possess similar qualities, the Periodic Table's order is organized in a very natural way.