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4. Structure of the Atom

Learn about 4. Structure of the Atom and discover its key concepts through interactive lessons and practical exercises.

Sections

STRUCTURE OF THE ATOM

This section discusses the structure of atoms, including the discovery of subatomic particles and the models developed to explain atomic structure.

4 Section Overview

Start current section content and materials

4.1 Charged Particles in Matter

Atoms are composed of charged sub-atomic particles, challenging the notion of indivisible atoms.

4.2 The Structure of an Atom

This section explains the structure of an atom, introducing the concepts of subatomic particles, their arrangements, and the various models of atomic structure.

4.2.1 THOMSON'S MODEL OF AN ATOM

J.J. Thomson's model proposed that atoms are composed of a positively charged sphere with electrons embedded within it.

4.2.2 RUTHERFORD'S MODEL OF AN ATOM

Rutherford's model revolutionized the understanding of atomic structure by postulating a nucleus at the center of the atom.

4.2.3 BOHR'S MODEL OF AN ATOM

Bohr's model introduces quantized electron orbits to explain atomic structure and stability, addressing limitations of previous atomic theories.

4.2.4 NEUTRONS

Neutrons are neutral subatomic particles discovered by J. Chadwick in 1932, which play a crucial role in the nucleus of atoms.

4.3 How are Electrons Distributed in Different Orbits (Shells)?

The section discusses how electrons are distributed within different energy levels or shells of an atom, primarily based on the rules provided by the Bohr-Bury model.

4.4 Valency

Valency refers to the combining capacity of an atom based on the number of electrons in its outermost shell.

4.5 Atomic Number and Mass Number

This section introduces the concepts of atomic number and mass number, explaining their significance in characterizing elements.

4.5.1 ATOMIC NUMBER

This section explores the concept of atomic number as the defining characteristic of an element, including its relationship with protons and mass numbers.

4.5.2 MASS NUMBER

The mass number of an atom is the total count of protons and neutrons in its nucleus, determining its identity and properties.

4.6 Isotopes

Isotopes are atoms of the same element with the same atomic number but different mass numbers, resulting from differing numbers of neutrons.

4.6.1 ISOBARS

Isobars are atoms of different elements that share the same mass number but have different atomic numbers, highlighting their unique properties.

Learning Objectives

  • Master the fundamentals of 4. Structure of the Atom

  • Apply learned concepts in practical scenarios

  • Successfully complete all chapter exercises