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ICSE Class 8 Chemistry Atomic Structure

When you sit to study the ICSE Class 8 Chemistry Chapter 4 Atomic Structure, you will come across topics such as the discovery of nucleus and distribution of electrons in orbits. Learn these topics and understand atomic structure with TopperLearning’s study materials. Also, study in detail about the parameter of an atom and the model of an atom with our revision notes.

Learning atomic structure becomes enjoyable when you watch the informative ICSE Class 8 Chemistry video lectures by enthusiastic Chemistry experts. Now, you can easily find these video lessons online on our study portal. In addition, get access to online resources like sample papers and practice tests to revise Chapter 4 and score marks in your Chemistry exam.

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Model of An Atom

Credit for the discovery of electron goes to J.J.Thomson, proton to E.Goldstein and neutrons to J. Chadwick.
J.J. Thomson proposed that electrons are embedded in a positive sphere.
The mass of positively charged proton and neutral neutron is one unit each.
The mass of negatively charged electron is about 1/1840 times the mass of a proton.

Discovery of Nucleus

Discovery of nucleus

Parameters of an Atom

Atomic number of an atom is the number of protons in the nucleus while the atomic mass of an atom is the sum of protons and neutrons in the nucleus.
An atom is neutral as the number of protons is equal to the number of electrons
Isotopes are atom of same element, with different number of neutrons. Isobars are atom of different elements with same mass number.

Distribution of Electrons in Orbits

Distribution of Electrons in Orbits

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