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DV Flame Test Lab Notes

Excited and ground state electrons plus emitted photons.

Clayton Piehl

on 25 October 2010

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Transcript of DV Flame Test Lab Notes

Flame Test Notes
Let's zoom in on the atom
Where a
Where are the electrons?
Electrons are contained
in Energy Levels
This is Beryllium
-What are the names of all of these energy levels?
-When electrons are in their normal place, they are
said to be in the ground state.
Yes they can!!! This is called the
Excited State
-What would an electron need
to go from a lower energy level
to a higher energy level?
Are electrons stationary?
-Can they move from one energy level to another?
What kinds of energy could these
electrons absorb to jump energy
levels to become excited?
Thermal Energy
Electrical Energy
Light Energy
We now have electrons in this
excited state.
-They won't stay in this excited state
It isn't stable
-They will fall back down to ground state
What is released when the electrons
go back to ground state?
But what kind of Energy?
Light Energy!!!
Different types or colors of
light have different energies.
What colors have a high energy?
When electrons fall, they release a
photon of light energy.
-The color depends on the amount
of energy released

-If an electron fell from the 5th energy
level, what color might it release?

-What about an electron that fell from
the 4th energy level to the 2nd?
The energy levels for every element
are slightly different because each
has a different # of protons.

-This means the energy for falling
electrons will be different for each

-What will this mean about the energy
released by these falling electrons?

-How will this difference be observable
in a flame test lab?
What causes the electrons to fall back
down to the lower energy levels?

What are they attracted to?
The negative electrons are attracted to the positive protons and fall back down.

Do all elements have the same # of protons?
So, falling electrons release light energy when they move back toward the nucleus, but how do we calculate how much energy?
We can calculate the energy using two

c =

Where is the wavelength, is the frequency
and c is the speed of light which is constant
(3.00 x 10^8 m/s)

E = h

E is the energy of the photon and h is Planck's
constant (6.63 x 10 ^ -34)
Full transcript