The elements in the periodic table are arranged according to their rising atomic number and recurrent chemical properties. They are arranged in a tabular format with rows representing periods and columns representing groups.
The order of the elements ascending atomic numbers is left to right and top to bottom. Thus,
- The valence electron configuration of elements belonging to the same group will be the same, resulting in identical chemical characteristics.
- In contrast, valence electrons in the same period will be arranged in ascending order. As a result, there are more energy sublevels per energy level as the atom’s energy level rises.
The first 94 elements of the periodic table are found naturally, whereas the last 95–118 elements have only been created artificially in labs or nuclear reactors.
The periodic table we currently use is a more advanced version of some models proposed by scientists in the 19th and 20th centuries. The periodic table was created by Mendeleev, who is the only person to receive credit for it.
The earliest version of the periodic table, which is close to the one we currently use, was proposed by Dimitri Mendeleev, who is sometimes referred to as the father of the periodic table. The primary distinction between Mendeleev’s periodic law and the current periodic law is this.
- While the present periodic law is based on the ascending order of atomic numbers, Mendeleev modelled his periodic table based on increasing atomic mass.
- Mendeleev was able to foresee the discovery and characteristics of several elements even though his periodic table was based on atomic weight.