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Formula Sheet

Structure of Atom

NIOS · Class 12 · Physics

All formulas from Structure of Atom in NIOS Class 12 Physics. Key equations, constants, and identities for board exam preparation.

43 questions36 flashcards5 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 Formulas · 2 Sections

Formulas

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 Correct vs Incorrect Understanding of Energy Levels in Hydrogen Atom, Evolution of Atomic Models: Historical Timeline, Structure of Atom — Complete Concept Map. These are the concepts NIOS Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Structure of Atom — NIOS Class 12 Physics?
Understand the core concepts first, then work through the 43 practice questions available for this chapter. Revise formulas and 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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