Question

Main source of helium is :

Answer 1

We have to remember that in chemistry, periodic tables play a vital role. In the periodic table totally $118$ elements. In the periodic table totally $18$ columns and $7$ rows. The columns are called groups. Hence, $18$ groups in the periodic table. The rows are called as period. Hence, totally $7$ period in the table. Each and every element having 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 property of the element.

Complete answer:
We have to remember that the atomic number of helium is $2$. The symbol of helium is ${\text{He}}$. The mass number of helium is $4$.
We must have to know that helium is one of the inert gas 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 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 ${\text{7\% }}$ of helium obtained from earth 's atmosphere.
Monazite is the main source of helium.

Note:
We must have to know that the atomic number of the element is dependent 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 number of protons and number of neutrons. Helium is one of the elements naturally having a stable electronic configuration.