NEET Physics Kotaby Prashant Sir

Atoms for NEET

Class 12 · What NEET asks, the NCERT lines it repeats, and where to study it free

Atoms in NEET: the numbers

63NEET / AIPMT questions in our PYQ bank (1988–2026)
35exam years with a question from this chapter
6NCERT lines NEET asked more than once

Topics NEET asks most

TopicQuestions
Bohr model and hydrogen spectrum 60
Rutherford model and alpha scattering 3

NCERT lines NEET asked again and again

Read these lines from your NCERT book twice: NEET has built questions on each of them more than once.

For an electron bound by an inverse-square force, K = -E and U = 2E . Going to a higher orbit raises E, so K falls and U rises.
AIPMT 1995AIPMT 2005NEET 2018NEET 2019
Only certain orbits are allowed: rₙ ∝n²/Z and Eₙ = -13.6 Z²/n² eV . So He⁺ in its ground state has -54.4 eV and a radius a quarter of hydrogen's.
AIPMT 1988AIPMT 2010NEET 2022NEET 2023
The series is fixed by the final level: Lyman (n_f = 1) is ultraviolet, Balmer (n_f = 2) is visible ; Paschen, Brackett and Pfund lie in the infrared.
AIPMT 2000AIPMT 2012NEET 2023NEET 2024
Use 1/λ = R(1/n_f² − (1/nᵢ²)). The longest line of a series is the smallest jump ; the series limit (from ∞) is the shortest.
NEET 2013NEET 2015NEET 2017NEET 2023
In a head-on hit the alpha's whole KE turns into Coulomb energy, so r₀ ∝Z/K : a larger target charge or a slower alpha gives a larger distance of closest approach.
AIPMT 2009AIPMT 2010NEET 2016
An atom excited to level n can come back down by many routes, giving (n(n − 1))/2 spectral lines . Find n first from the photon energy absorbed.
AIPMT 1993AIPMT 2006NEET 2014

Free lecture by Prashant Sir

ATOMS AND NUCLEI - Modern Physics L-8 | NEET Physics Crash Course | NCERT Physics Class 12 · 1.9M views on YouTube

Free NCERT notes for Atoms

How we learnt what is inside an atom: Rutherford's alpha scattering found the tiny nucleus, and Bohr's quantised orbits explained the hydrogen line spectrum. It is a short chapter, and NEET regularly asks quick numericals on Bohr radius, energy levels and spectral lines from it.

Read the chapter notes: key NCERT points, graphs, every formula with its meaning, tricks, common mistakes and NEET traps.

FAQ

How many questions come from Atoms in NEET?

Our bank of NEET and AIPMT papers (1988–2026) has 63 questions from Atoms, most of them from Bohr model and hydrogen spectrum, Rutherford model and alpha scattering.

Which NCERT line of Atoms has NEET asked the most?

This line has been asked 4 times in NEET/AIPMT: "For an electron bound by an inverse-square force, K = -E and U = 2E. Going to a higher orbit raises E, so K falls and U rises."

Where can I study Atoms for NEET for free?

Prashant Sir's full lecture is free on the NEET Physics Kota YouTube channel, and the chapter notes are free on Dhruv.