In this Article Sciphy is Providing Atoms NCERT Solution Chapter 12 Class 12 Physics. You Can Download PDF Of Same free of Cost. You can also Download 👉 •PDF Of All Chapters NCERT Solution Class 12 Physics. AS we know Importance of NCERT Text Books & their questions in Board exams n Competitive exams so we should focus on each & Every question of NCERT. Firstly try question Yourself after that check Solution. For Calculation work avoid use of calculator.
Syllabus Of Atom Chapter 👇
• Alpha Particle Scattering Experiment
• Rutherford ‘s Model of atom
• Bohr Model of Hydrogen Atom
• Expression for Radius of nth Possible Orbit
• Velocity and energy of electron in nth Orbit.
• Hydrogen line Spectra( Qualitative Treatment only)
PDF OF Atoms
About Atoms
Bohr’s Model:Bohr Modified Rutherford atom model to explain the line spectrum of Hydrogen.
Postulates Of Bohr’s Theory
• Stationary Circular Orbit :An Atom Consists of a central positively charged nucleus in certain orbits known as stationary Orbits. Coulomb force between Electrons & Nucleus provides Necessary Centripetal force.
• Quantum Condition: The stationary orbits are those in which angular momentum of electron is an integral multiple of h /2 π. i. e mvr = nh/2 π
• Transitions : Electron does not radiate energy when in a stationary orbit. When photon is emitted or absorbed electron jumps from one stationary orbit to other.
Radius of Orbit & Energy of Electrons in Orbit:
r = €0 h2 n2 /πmZe2
For H -atom Z =1, r = €0 h2 n2 /πme2
a0= 0.529 ×10-10 m
Energy Of Orbitting Electron En = -13. 6 /n2 eV.
T. E = – K. E
T. E = 1/2 P. E
Hydrogen Spectrum:
Hydrogen Emission Spectrum consist of 5 series:
(1) Lyman Series nf =1, ni=2,3 , 4,5…….
(2) Balmer Series nf =2 ni=3, 4,5……
(3) Paschen Series nf=3 ni= 4,5,6…..
(4) Brackett Series nf=4 ni= 5,6,7……
(5) Pfund Series       nf=5 ni= 6,7,8………
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FAQs
The Bohr’s Model is applicable to which kind of atoms?
which have only one electron.