Question

Name the three sub-atomic particles of an atom.

NCERT Class IX
Sciences - Exemplar Problems

Chapter 4. Structure of the Atom

Answer 1

The three subatomic particles are electron proton and neutron.

Electron:

In 1897 J.J Thomson discovered electron. Electrons are negatively charged particles found in the atoms of all the elements. They are called cathode rays because they come out of cathode (negative electrode). Electrons are located outside the nucleus in an atom. Only hydrogen atom contains one electron all other items contain more than one electron.
Mass of electron is so small that it is considered to be negligible.

Proton:

Proton was discovered by E.Goldstein. These particles are called anode rays because they were given out by the anode (positive electrode). The Proton is A positively charged particle found in the atoms of all the elements. The protons are located in the nucleus of an atom.

Neutron:

Neutron was discovered by James chadwick 1932. The neutron is a neutral particle found in the nucleus of an atom. Neutron is not present in a hydrogen atom. Neutron has no charge. It is electrically neutral.

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Answer 2

Answer:

see down

Explanation:

Protons, neutrons, and electrons are the three main subatomic particles found in an atom.