Energy and Development of Bohr Model & the Quantum Model Flashcards
Photoelectric Effect:
emission of e- from a metal when light shines on it
Diff between red light and violet light?
Red light did not eject e- from metal and Violet ejects e- right away
What happens if incoming light is not at a high enough energy?
electrons will not be ejected
What did Max planck propose?
that light does not emit electromagnetic energy like wave but in small “packets” of energy called quanta
Quantum of energy:
minimum amount of energy that can be lost/ gained by an atom
If there is enough energy…
electron is ejected at certain frequency (gives off color)
Energy formula:
E=hv
E(energy (J -joules)
h(plancks constant) -6.626x E-34 JxS
v (frequency (Hz)) - 1/s
what did Albert Einstein propose?
that electromagnetic radiation has a dual wave-particle nature
Photon:
particle of electromagnetic radiation haveing 0 mass + carrying quantum of energy
Light-emission spectrum:
bands of light
according to bohrs model, the e- …
can only circle nucleus in orbits w/ nothing in between
Ground state:
atom exists at lowest energy level
Excited state:
atoms absorb energy - electrons move from low energy level to a higher level
Electrons emit energy at a frequency…
= to energy absorbed, and return to ground state
Continuous Spectra: (white light)
continuously emitted lines of all colors
Emission:
electrons emit energy + move back to ground state
Absorbition:
electrons absorb energy and move to excited state
The problem with Bohrs model was that what?
did not apply to elements with more than one electron only Hydrogen
What did Louis De Brogile propose?
that an electron has wave-like properties
What did Erwin Shrodinger develop?
and equation that treated electrons as waves
What did Werner Heisenberg suggest that it was impossible to know?
where electron is located at all times
The Heisenberg uncertainty principle:
it is impossible to determine both position/ speed of electron
What is an electron?
a particle of matter that travels around nucleus as a wave
Quantum theory:
describes mathematically the wave properties of e-
Electrons exist in certain regions called:
orbitals
orbital:
three dimensional region around nucleus that indicates location of e-
