Structure of Atom — Chapter Summary
Punjab Board · Class 11 · Chemistry
Summary of Structure of Atom for Punjab Board Class 11 Chemistry. Key concepts: Atoms consist of three, Proposed in 1898 and Based on alpha particle.
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Overview
The structure of atom is fundamental to understanding chemistry. From ancient philosophers to modern quantum mechanics, our understanding of atoms has evolved dramatically. This chapter traces the discovery of sub-atomic particles (electrons, protons, and neutrons), explores various atomic models fr
Key Concepts
Atoms consist of three fundamental particles
Atoms consist of three fundamental particles: electrons (negative charge, mass = 9.109 × 10⁻³¹ kg, charge = -1.602 × 10⁻¹⁹ C), protons (positive charg
Proposed in 1898
Proposed in 1898, Thomson suggested atoms are uniform spheres of positive charge with electrons embedded within, like plums in pudding. He calculated
Based on alpha particle scattering experiments
Based on alpha particle scattering experiments (1909), Rutherford concluded that atoms have a tiny, dense, positively charged nucleus at the center wi
Atomic number (Z) = number
Atomic number (Z) = number of protons = number of electrons in neutral atom. Mass number (A) = number of protons + number of neutrons. Represented as
Isotopes are atoms of same element
Isotopes are atoms of same element (same Z) with different numbers of neutrons (different A). Examples: ¹²₆C, ¹³₆C, ¹⁴₆C. Isobars are atoms with same
Learning Objectives
- Know about the discovery of electron, proton, and neutron and their characteristics
- Describe Thomson, Rutherford, and Bohr atomic models
- Understand important features of the quantum mechanical model of atom
- Understand nature of electromagnetic radiation and Planck's quantum theory
- Explain the photoelectric effect and describe features of atomic spectra
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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