ESSENTIAL QUESTION: How are electrons arranged in atoms?
RELEVANCE: Where do electrons live?
NGSSS: SC.912.P.8.5; MAFS.912.N-Q.1.1; LAFS.910.WHST.1
LEARNING OBJECTIVES: Students will be able to:
-apply basic rules of electron configuration to determine the valence electrons of an atom and their chemical and physical properties.
-explain that when electrons transition to higher energy levels they absorb energy, and emit energy when they transition to lower energy levels.
-continue quarterly project how does pH affect plant growth.
BELL RINGER: List the number of valence electrons for elements hydrogen, lithium, sodium, nitrogen, helium, and neon.
VOCABULARY: energy, ground state, excited state, emission spectra, photon, Planck’s constant, quantum, quantum mechanical model, electron configuration, atomic orbital, energy levels, Aufbau Principle, Pauli Exclusion Principle, Hund’ Rule
HOME LEARNING: HL 4 Electron Configuration
RESOURCES: Youtube I Heart Electron Configuration
AGENDA
WHOLE GROUP
We reviewed connections with ELA and other subjects. In addition to writing, we are comparing and contrasting.
The bell ringer is to list the number of valence electrons for the following elements: hydrogen, lithium, sodium, nitrogen, helium, and neon.
Home learning 3 wa collected and reviewed, and HL 4 was distributed. You can find it below.
This is HL 4. I will make a copy for you.
We revisited the Electron configuration song. The lyrics are:
I Heart Electron Configuration Song
The first energy level is really
small.
It hardly has room for electrons at
all.
An S sublevel is all there is
With two electrons that constantly
whiz.
Chorus
1s2, 2s2, 2p6,
3s2, 3p6, 4s2, 3d10… Whoo!
A little bit larger the second shell.
Two sublevels therein do dwell.
An S sublevel that maxes at two and
a six for a P
If that’s OK with you (It’s OK with me).
Chorus
1s2, 2s2, 2p6,
3s2, 3p6, 4s2, 3d10… Whoo!
The third shell is even larger still.
An S and a P top the bill.
A D sublevel is added on top.
Ten electrons can fit at a pop! (pop, pop, pop, pop pop, pop, pop, pop, pop!)
Chorus
1s2, 2s2, 2p6,
3s2, 3p6, 4s2, 3d10… Whoo!
The fourth shell is the largest yet.
An S and a P and a D, I’ll bet.
An f sublevel is also seen.
How many electrons? Up to fourteen! (Fourteen?
That’s a lot!)
Chorus
1s2, 2s2, 2p6,
3s2, 3p6, 4s2, 3d10… Whoo
Spoken
Electrons are found outside the
nucleus. They zip around in energy levels which are made up of sublevels which
can then be broken down into orbitals and two electrons per orbital; each one
has opposite spin. (Whoo, whoo, whoo, whoo, whoo, whoo!)
Chorus
And it’s 1s2, 2s2,
2p6, 3s2, 3p6, 4s2, 3d10… Whoo
Why does 4S fill up before 3D? (Don’t know!)
Because the 4th shell’s enormous, you see.
Overlap 4S has less energy
Than the supposedly lower 3D. (3D? I love
seeing in 3D!)
Chorus
1s2, 2s2, 2p6,
3s2, 3p6, 4s2, 3d10… Whoo
The overlaps increase in frequency (Oh?)
4F fills up way after 5P (That’s it.)
Keep track of the overlaps, it’s really cool (Ah)
You just gotta use the diagonal rule! (I love
the diagonal rule!)
Chorus
And 1s2, 2s2,
2p6, 3s2, 3p6, 4s2, 3d10… Whoo!
I can’t wait, just tell me when.
Count ‘em all up, and lets start again!
One sublevel fills and the next can start.
Electron config is something that I heart! (Oh
yeah!)
Chorus
And now, it’s 1s2, 2s2, 2p6,
3s2, 3p6, 4s2, 3d10…
Students then completed the lab write up for the Flame Test and submitted it.
SMALL GROUP/INDEPENDENT PRACTICE/DI
Students who compete work early should go to CK-12.org (log in with username and password) and do the physics simulation light wave.
HOTS:
-Why does the 4s energy level fill before the 3d level?
-What exceptions to the electron configuration rules might there be? Why?
EXIT STRATEGY: summarize notes.
