Chemistry · Class 11 · Chapter 2
Structure of Atom
12 lessons 116 min 2 simulations
This chapter opens Dalton's indivisible atom and finds electrons, protons and neutrons inside it, then follows the models that tried to arrange them: Thomson's, Rutherford's and Bohr's. Light turns out to come in packets (quanta), hydrogen glows only at fixed wavelengths, and electrons behave as waves, which leads to the quantum mechanical model with its orbitals, four quantum numbers and the rules for writing electronic configurations.
What the exam asks
NEET asks Bohr-model numericals (radius, energy, transition wavelengths for H and He⁺), photoelectric energy balances, de Broglie and uncertainty calculations, and above all quantum numbers, nodes, the (n + l) rule and configurations including Cr and Cu. Marks go on sign errors in energies, on mixing up ν and ν̄, on treating brightness as if it raised electron energy, and on radial versus angular node counts.
Lessons
12 lessons · 116 min
1Discovery of sub-atomic particlesNCERT §2.19 min2Thomson and Rutherford modelsNCERT §2.2.1; §2.2.2; §2.2.58 min3Atomic number, isotopes and isobarsNCERT §2.2.3; §2.2.48 min4Wave nature of electromagnetic radiationNCERT §2.3.18 min5Planck's quantum theory and photoelectric effectNCERT §2.3.212 min 1 sim6Atomic spectra and the hydrogen spectrumNCERT §2.3.38 min7Bohr's model of the hydrogen atomNCERT §2.4; §2.4.1; §2.4.212 min 1 sim8Dual behaviour of matter and uncertainty principleNCERT §2.5; §2.5.1; §2.5.29 min9Quantum mechanical model and quantum numbersNCERT §2.6; §2.6.18 min10Shapes and energies of orbitalsNCERT §2.6.2; §2.6.39 min11Filling of orbitals and electronic configurationNCERT §2.6.4; §2.6.5; §2.6.68 min12Chapter reviewMust-know facts, traps and formulas17 min