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Structure of Atom : CBSE Class 9 IX Science
Hello Students, here we are going to study the topic of, Structure of Atom from CBSE class 9 Science.
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Matter is made up of tiny particles called atoms.
Atoms are further made of three fundamental particles or subatomic particles called electron, proton, and neutron.
Protons and neutrons are almost of the same mass.
The mass of a proton is approximately 2000 times as that of the electron.
Discovery of Subatomic Particles
(a) Electron (e):
The electrode connected to the negative end was known as the cathode and that to the positive as anode. He then observed a stream of negatively charged particles coming out of cathode towards the anode. These particles were called electrons.
The collection of negatively charged particles emitted from cathode of the discharge tube is called cathode rays.
(b) Proton (p):
In 1886, Goldstein observed in the same experiment, with different situations that the anode emitted positive particles which were called Canal rays: The positively charged radiations produced in the discharge tube from the anode are called Canal rays.
(c) Neutron (n):
These neutrally charged particles were discovered by James Chadwick in 1932. Neutrons are present in atoms of all elements except Hydrogen.
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