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Unit 3 Electron configurations. Part B Bohr’s Model of Hydrogen. Discharging Tubes. What have we learned so far?. The Flame Test. The light coming out of the excited atomic entities is very specific to particular element! Results are quite reproducible.

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unit 3 electron configurations

Unit 3 Electron configurations

Part B

Bohr’s Model of Hydrogen

what have we learned so far

Discharging Tubes

What have we learned so far?

The Flame Test

The light coming out of the excited atomic entities is very specific to particular element!

Results are quite reproducible.

slide3

Electromagnetic radiations (lights) coming out or being absorbed by atoms indicate that there are very specific energy changes within the atomic entities (atoms and ions).

No nuclear changes have ever been observed indicate that the energy changes have to come from electrons surrounding the nucleus.

slide4

How Come?

Classic Model:

Electron anywhere it ‘wants’ to be

Problems with classic model:

E moving through electric field will emit light & from the classic model, emitted light should have differing wavelengths

slide5

Niels Bohr (1885 – 1962)

Increasing energy with

greater distance from nucleus

bohr s model of hydrogen atom

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Bohr’s Model of Hydrogen Atom

Fifth-excited

  • Further away from the nucleus means more energy.
  • There is no “in between” energy
  • Energy Levels

Fourth

Third

Increasing energy

Second

First-ground

Nucleus

bohr s model of hydrogen atom1
Bohr’s Model of Hydrogen Atom

quantum– quantity of energy gained or lost by an atom when electrons are excited

photon– a quantum of light

ground state – lowest energy level of an atom

excited state – a heightened state of energy in an atom

Electrons of hydrogen circle the nucleus in orbits

1. orbits have a fixed amount of energy in the ground state.

2. orbits are a fixed distance from the nucleus.

3.orbits furthest from the nucleus have the greatest energy.

slide11

Bohr’s Model of Hydrogen Atom

Orbits

Transitions of e between those orbits involve change in energy

Change in energy (E(n2 –n1) has to be accounted for

By photons

Successful in accounting for most of the H-1 emission/absorption spectral lines

BUT only works for H-1

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