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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Bohr’s Model of Hydrogen
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.
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
Increasing energy with
greater distance from nucleus
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.
Transitions of e between those orbits involve change in energy
Change in energy (E(n2 –n1) has to be accounted for
Successful in accounting for most of the H-1 emission/absorption spectral lines
BUT only works for H-1