Class 11 Chemistry — Chapter 2: STRUCTURE OF ATOM

What you'll learn

• ▸Discovery of the Electron and Cathode Rays
• ▸Discovery of Protons and Neutrons
• ▸Early Atomic Models: Thomson and Rutherford
• ▸Bohr's Model for the Hydrogen Atom
• ▸Dual Nature of Matter and Radiation
• ▸Heisenberg's Uncertainty Principle
• ▸Quantum Numbers and Atomic Orbitals
• ▸Principles for Filling Atomic Orbitals
• ▸Electronic Configurations of Atoms

Chapter Summary

--- PAGE 1 --- UNIT 2 11082CH02 STRUCTURE OF ATOM Objectives After studying this unit you will be able to * know about the discovery of electron, proton and neutron and their characteristics; * describe Thomson, Rutherford and Bohr atomic models; * understand the 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; * state the de Broglie relation and Heisenberg uncertainty principle; * define an atomic orbital in terms of quantum numbers; * state aufbau principle, Pauli exclusion principle and Hund's rule of maximum multiplicity; and * write the electronic configurations of atoms. “The rich diversity of chemical behaviour of different elements can be traced to the differences in the internal structure of atoms of these elements. The existence of ato…

Practice Questions from this Chapter

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1. Explain how atoms hold together. Get Solution →
2. Show a simplified atom diagram. Get Solution →
3. Describe how electricity moves. Get Solution →
4. Who first proposed an atomic theory on a firm scientific basis in 1808? Get Solution →
5. The word 'atom' is derived from the Greek word 'a-tomio', which means: Get Solution →
6. In a cathode ray discharge tube, the stream of particles moves from the: Get Solution →
7. What are the negatively charged particles that constitute cathode rays called? Get Solution →
8. Who measured the charge-to-mass ratio (e/me) of the electron in 1897? Get Solution →

Did you know?

• 💡 Your body contains atoms from ancient stars.
• 💡 Most of an atom is actually empty, vast space.
• 💡 Electric eels can create enough electricity to power a light bulb.
• 💡 The tiny electric signals in your brain allow you to think.
• 💡 A single drop of water has more atoms than all stars in the universe.

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