Name: Subatomic Particles
Uploaded: 2019-07-19
Duration: 6 min 2 s
Description: A subatomic particle is a particle of a size smaller than that of an atom. Protons, electrons, and neutrons are examples of these particles.

Question

Compare the atomic models you have studied in your book of class IX.

Accepted Answer

In this book of standard IX we have studied three modes of atom:

1. Thomson's Atomic Model.

2. Rutherford's Atomic model.

3. Bohr's Atomic Model.

Thomson Atomic model Rutherford’s Atomic Model Bohr’s Atomic model

Nucleus Nucleus was not explained in this model, but he told that atom consists of a positively charged sphere. Nucleus was explained as hard, small, dense and positively charged part of the atom which is centrally located. Bohr used Rutherford’s explanation on Nucleus, that it is a hard, small, dense and positively charged part of the atom which is centrally located.

Thomson Atomic model Rutherford’s Atomic Model Bohr’s Atomic model

Neutrons and protons Neutrons and protons were not explained He told that the positively charged nucleus is made up of protons and contributes all the mass of atom, but he didn't explain about neutrons as it wasn’t discovered till then. He explained that the nucleus is positively charged and consists of protons and neutrons in it which contribute all the mass of an atom.

Thomson Atomic model Rutherford’s Atomic Model Bohr’s Atomic model

Electrons He explained that negatively charged electrons are embedded in a positively charged sphere He explained that negatively charged electrons revolve around the nucleus He explained that negatively charged electrons revolve around the nucleus in a fixed energy shell.

Thomson Atomic model Rutherford’s Atomic Model Bohr’s Atomic model

Energy Shells/Orbits This model didn’t explain energy shells. This model didn’t explain energy shells. This model explained energy shells are the circular path in which electron revolves around the nucleus.

Compare the atomic models you have studied in your book of class IX.

Important Questions on Structure of Atom

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