GOB Chemistry

Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.

Atoms and the Periodic Table

Emission Spectrum (Simplified)

Emission Spectra is a series of lines formed when emitted light is focused by a slit and passed through a prism.  

Emission Spectrum



Emission Spectrum (Simplified) Concept 1

The video is coming soon
Was this helpful?
now, emission spectra is a series of lines form when the mid light is focused by his splint and passes through a prison. So remember we have our atom here and here. We have our first shell. And theoretically there's an infinite number of shells within a given out. We haven't found all the elements in the universe. So there are elements out there that we still don't know about. So the number of shells is infinite. And we're going to say here, we have an electron that's at a higher energy state and higher energy level. And what's going to happen is eventually it starts to come back down to its ground state. So it's dropping back down to the first shell. Remember as an electron drops back down from a higher shell to lower shell, it emits energy. This energy is emitted as light. What happens here is a slip will focus this energy, and what happens there is it passes through a prison. This prism allows us to split that energy into its various wavelengths and create this emission spectrum. So remember, a slit is just a narrow, long, narrow cut youth to spread closely packed wavelengths, which can later be measured. So we can examine this electron emission spectrum and we can measure the wavelength of each one of these colored blinds. Just realize you that the prism itself, it helps to transform these wavelengths into discrete lines on the emission spectrum. So all that's really going on here is we're focusing the emitted energy as an electron drops from a higher shell number down to a lower shell number and imposing them on emission spectrum. From there, we can calculate their wavelengths and in that way also calculate the energy and or frequency of these different wavelengths of light.


Emission Spectrum (Simplified) Example 1

Play a video:
Was this helpful?
the lines in an atomic emission spectrum are due to the presence of isotopes. While when we talked about the emission spectrum that's created, we never mentioned isotopes movement of electrons from higher energy states to lower energy states in atoms. We did say this. We said that as the electron falls from a higher energy level or shell number to a lower one, it emits energy in the form of light. The slit focuses this energy through a prism in order to superimpose it on an emission spectrum. So this is true here, nuclear transitions in atoms, which we never discussed. And then this isn't the opposite. It's saying we're going from a lower energy state to a higher energy state. This would require absorption of energy. So the slip wouldn't be able to focus any emitted energy to create our emission spectrum. So this is the opposite of what is needed. So here, option B would be the best answer. And remember the name is emission spectrum. So remember what a mission is. We're going from a higher energy state or Shell number two allure one that she had been a key indicator. That option B was the best answer.

The emission spectrum of helium is shown below. Which emission spectrum line has the highest energy?