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NIELS HENRIK DAVID
BOHR
Contribution to Atomic Theory
NIELS HENRIK DAVID BOHR
• Physicist, scientist, humanitarian, and mathematician
• Born October 7, 1885
• From Copenhagen, Denmark
• Died November 18, 1962
• Father was celebrated physicist
• Studied at University of Copenhagen
• Won 1922 Nobel Peace Prize in physics
NEILS BOHR’S
CONTRIBUTION TO
THE ATOMIC THEORY
Dates of Importance
1913
• Neil completed the Bohr Model
- This model proposed that electrons circled the atom’s nucleus in a
certain way, therefore it also explained that electron traveled in
specific energy.
- The model also purposed that electrons could drop from higher
energy orbit to a lower orbit. Also showed the light quantum of
distinct energy, which formed the bases for the quantum theory.
- Quantum theory showed the specific relation proportion of an
electron and how it circulates the atoms’ nucleus
1922
• Bohr received a Nobel Prize in Physics for work of "for his
services in the investigation of the structure of atoms and of the
radiation emanating from them."
• He continued to study new quantum principles which
ultimately explained why light can be seen as a particle and
wave but not at the same time
• He developed an explanation for atomic structure that uses the
periodic table of elements.
1930
• Neil clarified problems in quantum physics
• Work on nuclear fission and created liquid droplet theory
which described the way neutrons and protons behaved.
1950’S
• In 1954 , Neil assembled the Atoms for Peace Conference of
1955.
• In 1957, Bohr received the Atoms for Peace Award for his
theories and examples to show how to use atomic energy
responsibly.
1962
• Returned to Copenhagen and furthered studied nuclear
energy.
NIELS BOHR
And the Atomic Theory
THE BOHR MODEL
• The Bohr Model of the atom revealed some of the
most important properties of molecular and Atomic
structure.
• The Bohr model gave way to the theory of Atoms,
which is called Quantum mechanics.
• Model was brought up in 1913.
• Electrons orbit around the nucleus which contains
the Neutrons and Protons.
• Proposed that Atoms moved In fixed paths around
the nucleus, like planets orbiting a sun.
Bohr’s model
continued…
• Bohr concluded that the outer orbits could hold more electrons
than the inner ones.
• He also concluded that these outer orbits can determine an
atom's chemical properties, and that Atoms emit radiation and
light when an electron jumps from an outer orbit to an inner
one.
• Later other physicists expanded his theory into quantum
mechanics. Which explains the structure and complexity in the
actions of atoms.
Bohr’s Experimental Procedures
• Using the Young’s slit device, Bohr delimited two quantum paths
between the source and the detecting plane.
• Bohr composed an accurate formula for the energy levels of a
hydrogen atom using Planck’s constant. He hypothesized that
the angular momentum of the electron is quantized (which
means it only has discrete values). He concluded that because
of this quantization, electron orbits have fixed sizes and
energies.
• The orbits are labeled by the quantum number n.
NEILS BOHR:
CONTRIBUTIONS TO
THE ATOMIC THEORY
Will Westenberger
Jhace Smith
Tiphani Cohens
Samantha Silva-Nash
ANALYSIS AND CONCLUSION
FROM HIS EXPERIMENT
This Bohr model, a quantum model
shows that hydrogen absorbs light when an
electron moves from one energy level to
another. The electron can move from a low
energy orbit to a high energy orbit and give off
light or the electron can move from a high
energy orbit to a low energy orbit and give off
light. The light comes from the electric
discharge that is created by the atoms that have
moved.
For example when an electron goes
from a low energy orbit such as n=1 to n=7 the
atoms that have been moved by an electric
discharge can give off light when the electrons
move to the higher energy orbit.
A real life example would be a neon
light, when the neon gas has electricity added
to it the electrons shift around causing atoms to
move which gives off the neon light.
http://www.neonsignworld.
com/neon_lights.htm
NEILS BOHR QUOTES
• "Never express yourself more clearly than you are able to
think.“
• "Every great and deep difficulty bears in itself its own solution.
It forces us to change our thinking in order to find it."
• "Everything we call real is made of things that cannot be
regarded as real.“
• “No, no, you're not thinking; you're just being logical.”