neils bohr atomic model
TRANSCRIPT
PENCHAL REDDY HIGH SCHOOL
CHEMISTRYCHEMISTRYPower Point Presentation
N. BHARGAV SAI 027
N.SHAKEER 030
P. UMA MAHESH 033
A. MOUNIKA 045
About Neils Henry Bohr
Name: Neil Henry Bohr
Year: 1885 – 1962
Country: Copenhegan (Denmark)
Year of Noble Prize: 1922
Bohr's Model of the AtomMain Postulates:
Electrons revolve around the nucleus in a definite circular path called
orbit or shells in an atom.
These orbits or shells called Energy Levels or Energy Shells. These are
designated by letters, K,L,M,N. The Energy of orbits closest to nucleus has lowest energy & Farthest
away from the nucleus has highest energy.
Bohr's Model of the Atom Energy of electron remains constant. So, these shells are also called
Stationary States. Electrons moves from lower energy level to higher energy level by
absorbing energy.
Electrons moves from higher energy level to lower energy level by
losing energy.
Bohr's Model of the Atom
Nucleus
Electron
Orbit
Energy Levels
Bohr's Model of the Atom
Bohr's Model of the Atom
Bohr's Model of the Atom
Bohr's Model of the Atom
Electrons orbit the nucleus like planets orbit the sun.
Each orbit can hold a specific maximum number of electrons.
Bohr's Model of the Atom
The theory could not account for the spectra of atoms more complex than
hydrogen.
The theory does not give any information regarding the distribution and
arrangement of electrons in an atom.
It doesn't explain, the experimentally observed variation in intensity of the
spectral lines of the element.
Bohr's theory could not account for the fine structure of spectral lines.
Bohr's theory could not explain the Stark and Zeeman effects.
1. https://en.wikipedia.org/wiki/Bohr_model2. http://images.tutorvista.com/cms/images/81/neils-bohr-model-atom1.png3. https://upload.wikimedia.org/wikipedia/commons/1/17/Bohr_atom_animation_2.gif5. http://abyss.uoregon.edu/~js/glossary/bohr_atom.html 6. Saraswati Chemistry Text book of 9 CBSE.
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Alpha particle
Large angle of deflection, must have hit massive object!
moth
deer
Gold Atom
Thank you