Line-emission Spectrum
Line-emission SpectrumChapter 3.3 p. 93Atoms can release
lightElectrons can be in a number of distinct orbitals like in the
Bohr Model of the atomOrbitals closer to the nucleus have low
energyOrbitals further from the nucleus have high energy
Atoms can release lightElectrons are normally in a state of
lowest possible energy its ground stateElectrons are able to jump
between energy levels If energy is added to an electron it will
jump to a higher energy level not it is in its excited state
Atoms can release lightElectrons at a higher energy level are
unstable and can move to a lower energy level by releasing
energyThis energy is released as light that has a specific
wavelength
Line-emission spectrum
Atoms can release lightIn 1913, Bohr passed an electric current
through hydrogen gas (this gave energy to the electrons) Bohr
observed a violet/blue light being emitted from the hydrogen
gasWhen he passed this light through a prism, he observed that the
light split into a few different colors
Atoms can release lightHe discovered that electrons are able to
jump and fall to a number of different levels depending on how much
energy is addedHow far they fall decides the wavelength that they
will release
Neonhttp://www.youtube.com/watch?v=zPDoBjlpxXYhttp://www.youtube.com/watch?v=1y0zhWp_4Sw
Atoms can release lightThe pattern of visible light that the
hydrogen gas released showed the wavelengths that were releasedThis
is known as a line-emission spectrumBohr did a number of
calculation and showed that the spectrum perfectly matched his
model of the atomhttp://www.youtube.com/watch?v=8TJ2GlWSPxI
Line-emission spectrum
Flame spectrumhttp://www.youtube.com/watch?v=SdpY53AWCvY
