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Formula Sheet

Structure of Atom — Formula Sheet

NIOS · Class 12 · Physics

8 formulas from Structure of Atom (NIOS Class 12 Physics) on one page, grouped by topic. Part of the NIOS Class 12 Physics syllabus.

43 questions36 flashcards8 formulas & key relations5 concepts

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An illustration of J.J. Thomson's atomic model, depicting a sphere of uniformly distributed positive charge with negatively charged electrons (like plums) embedded within it.
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8 Entries · 2 Sections

Formulas and Key Relations

Bohr's Model — Postulates

mv²/r = (1/4πε₀)(Ze²/r²)

L = mvr = nh/2π

ΔE = Eᵢ − Ef = hν (emission); ΔE = Ef − Eᵢ = hν (absorption)

Bohr's Model — Key Formulas and Energy Levels

rₙ = n²h²ε₀ / (Ze²mπ) = n²a₀/Z

vₙ = Ze² / (2ε₀nh) = v₁/n (for hydrogen)

Eₙ = −me⁴ / (8ε₀²h²n²) = −13.6Z²/n² eV

KE = (1/2)mvₙ² = +13.6Z²/n² eV

PE = −mvₙ² = −2 × (13.6Z²/n²) eV

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Frequently Asked Questions

What are the important topics in Structure of Atom for NIOS Class 12 Physics?
Key topics in Structure of Atom include Historical Development of Atomic Models, Rutherford's Alpha Particle Scattering Experiment, Rutherford's Nuclear Model and Its Limitations, Bohr's Model of Hydrogen Atom. Study these first, then practise questions on each for the NIOS Class 12 board exam.
How many formulas are in Structure of Atom?
This sheet lists 8 formulas from Structure of Atom, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Structure of Atom for the NIOS Class 12 board exam?
Learn the core ideas first, then work through the 43 practice questions on Structure of Atom. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All NIOS Class 12 Physics Formula Sheet

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