Question: What are the three elements known as that were classified by Johann Debierne?...

Question

What are the three elements known as that were classified by Johann Debierne?

Answer 1

Solution

As we know that in the world there are a lot of elements in various forms. For study and developing purposes, classification happens. Periodic table used to study the elements in easy form. If one new element is discovered, it means, based on the physical and chemical property we placed in the periodic table. The atomic number of the element is nothing but the number of electrons or number of protons. The mass number of the atom is nothing but the sum of the number of protons and number of neutrons. In general we move left to right metallic property of the atom decreases. We move right to left and non-metallic property decreases.

Complete answer:
We need to know that chlorine, bromine and iodine are the three elements known that were classified by Johann Debierne. The Johann Debierne is based on the atomic weight of the atom. The atomic weight of bromine is equal to the average atomic weight of chlorine and iodine atoms. In this way, he classified lithium, sodium and potassium as one set and Iron, cobalt and nickel as another set of atoms.

Note:
We have to know that in chemistry, the periodic table plays a vital role. Now we are using a modern periodic table. This modern periodic table consists of totally $118$ elements. In the periodic table there are totally $18$ columns and $7$ rows. The columns are called groups. Hence, $18$ groups in the periodic table. The rows are called periods. Hence, totally $7$ period in the table. In general, modern periodic table ordering is based on the atomic number of the atoms. The lowest atomic number starting from the first and followed by a higher atomic number. In the modern periodic table, metallic atoms are placed on the left side of the table and non-metallic atoms are placed on the right side of the table. Metalloids and transition elements are placed in between metal and non-metal elements. Below the two rows are there. There are nothing but lanthanides and actinides. These are f-block elements.