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Home » Class 9 » Structure of an atom » Bohr’s Model of an Atom

Bohr’s Model of an Atom

Last Updated on July 3, 2023 By Mrs Shilpi Nagpal

Question 1 Describe Bohr’s model of an atom?

Question 2 How did Neil Bohr’s explain the stability of atom?

Question 3 Why is an atom neutral inspite of the presence of charged particle in it?

Bohr’s Model Of An Atom

1) An atom is made up of three particles: electrons, protons and neutrons. Electrons have negative charge, protons have positive charge whereas neutrons have no charge. Due to the presence of equal number of negative electrons and positive protons, the atom on the whole is electrically neutral.

2) The protons and neutrons are located in a small nucleus at the centre of an atom. Due to the presence of protons, nucleus is positively charged.

3) The electrons revolve around the nucleus in fixed circular paths called energy levels or shells. The energy levels or shells are represented in two ways:

a)K,L,M,N…….

b)1,2,3,4,5……

bohr model
4) The first energy level or k shell can hold maximum of 2 electrons.

The second energy level or L shell can hold maximum of 8 electrons.

The third energy level or M shell can hold maximum of 18 electrons.

The fourth energy level or N shell can hold maximum of 32 electrons.

electrons in different shells
5) Each energy level or shell is associated with fixed amount of energy. There is no change in energy as long as they keep revolving in same energy level.

6) The change in energy of an electron take place when it

a) Jumps from lower energy level to higher energy level (gain energy)

b) Jumps from higher energy level to lower energy level (Loses energy)

Filed Under: Class 9, Structure of an atom Tagged With: bohr's model of an atom, electrons, energy level, K shell, L shell, M shell, N shell, neutrons, protons, shells

About Mrs Shilpi Nagpal

Author of this website, Mrs. Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed. (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading free education to everyone.

Reader Interactions

Comments

  1. Sumer says

    December 9, 2018 at 10:50 pm

    Best

  2. samara says

    January 19, 2019 at 2:58 am

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  3. Kavitha says

    March 10, 2019 at 3:56 pm

    Thanks

  4. Rajnish says

    March 11, 2019 at 1:17 am

    Osm

  5. Neeraj sandhu says

    March 19, 2019 at 10:14 am

    Thanks

  6. azhar says

    October 12, 2020 at 1:18 pm

    it is the best description

  7. Chilin Pangilinan says

    November 1, 2020 at 2:36 pm

    Very good article and very helpful. Thank you!

  8. Diya says

    March 1, 2021 at 12:17 pm

    Thanks for helping………
    Thanks a lot.

  9. Swarnayu Gope says

    November 25, 2021 at 8:46 pm

    NICE AND EASY LABELED DIAGRAM.

  10. Raja ahmad says

    February 15, 2022 at 9:24 pm

    Thanks It’s easy to understand

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