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here is your answer

justification of Bohrs model of atom

1 an atom is made up of three particles :electron ,proton and neutron

2 the protons and neutrons are located in the small nucleus at the centre of an atom

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Postulates of the Bohr Atomic Model

1. Electrons revolve around the nucleus in a fixed circular path termed “orbits” or “shells” or “energy level.”

2. The orbits are termed as “stationary orbit.”

3. Every circular orbit will have a certain amount of fixed energy and these circular orbits were termed orbital shells. The electrons will not radiate energy as long as they continue to revolve around the nucleus in the fixed orbital shells.

4. The different energy levels are denoted by integers such as n=1 or n=2 or n=3 and so on. These are called as quantum numbers. The range of quantum number may vary and begin from the lowest energy level (nucleus side n=1) to highest energy level. Learn the concept of an Atomic number here.

5. The different energy levels or orbits are represented in two ways such as 1, 2, 3, 4… or K, L, M, N….. shells. The lowest energy level of the electron is called the ground state. Learn the concept of Valency here in detail.

6. The change in energy occurs when the electrons jump from one energy level to other. In an atom, the electrons move from lower to higher energy level by acquiring the required energy. However, when an electron loses energy it moves from higher to lower energy level.

Therefore,

1st orbit (energy level) is represented as K shell and it can hold up to 2 electrons.

2nd orbit (energy level) is represented as L shell and it can hold up to 8 electrons.

3rd orbit (energy level) is represented as M shell and it can contain up to 18 electrons.

4th orbit (energy level) is represented as N Shell and it can contain maximum 32 electrons.

Or if you find difficulty in postulates of bohr model of an atom you can also write this :

1) Only Certain special orbits known as discrete orbits of electrons, are allowed inside the atom.

2) While revolving in discrete orbits the electron don't not radiate energy.

These orbits or shells are called energy level in an atom are shown in figure.