Question

Helium is used in diving apparatus. Give reasons.

Answer 1

In chemistry, periodic tables play a vital role. In the periodic table there are 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, total $7$ periods in the table. Each and every element has a specific symbol in the periodic table. Each element having a specific position in the periodic table, that position is dependent on the physical and chemical properties of the element. The atomic number of helium is $2$. The symbol of helium is ${\text{He}}$. The mass number of helium is $4$.

Complete answer:
Helium is one of the inert gases or noble gases in the periodic table. Helium is present in the first period and eighteen groups of the periodic table. The electrons are filled in at the first energy level of the helium atom. Helium contains two electrons in the orbitals. In the periodic table, helium is the first stable element. Nearly $7\%$ of helium is obtained from earth 's atmosphere.
We have to remember that the helium is used in diving apparatus. In our body helium is used for the solubility of oxygen and acts as the one of the diluent in the blood circulation in the nervous system.

Note:
The atomic number of the element depends on the number of electrons or number of protons. The atomic number of the element is equal to the number of electrons or number of protons. The mass number of the atom depends on the number of protons and number of neutrons. The mass number of the atom is equal to the sum of the number of protons and number of neutrons. Helium is one of the elements naturally having a stable electronic configuration.