Name: _______________________________________________ Period: _____ Date: _______________
Nature of Electrons Notes
Scientists noticed when certain elements are___________________________________________________,
they_________________________!
The light given off when an element is heated is called it’s ________________________________________

The atomic emission spectrum is a ______________________________________for every element!

The color is like the “signature” of that element

It can be ______________________________________________like a fingerprint can identify you!

_______________________________________________________________________________!!!
Scientists began to wonder . . . _____________________________model is good, but it doesn’t
explain some things.
Rutherford’s model did not explain:

why different elements react differently (and have different atomic emission spectra)

______________________________________________________________
______________________worked with ______________________and developed a new model of the atom:
_______________________________________________________
Bohr’s Planetary Atomic Model:

electrons move around the nucleus _______________________________________________(paths)
much like planets orbit the sun
Each “orbit” has a certain level of energy

__________________________________= _________________________________

__________________________________= _________________________________
Electrons are able to _______________________________________________________one at a time
(like climbing the rungs of a ladder)
The LOWEST energy level available is called the ___________________________________

Where is the ground state? ___________________________________________________________
As an electron “jumps” from a low energy level________________________________________________,
it needs to ________________________________and become “______________________”
•
like you need energy to “jump” up high!
electron that absorbed
energy and is “excited”
ground state
nucleus
Once an electron is “excited” and in a higher energy level, ________________________________________
because it’s not the “home orbit”
An electron _____________________________________________________________________________

Every time an electron drops levels, it_______________________________– this is the light that we
see when we put an element into a flame!

The electrons _____________________________________________before they go “home”
electron in ground state
that emitted light energy
nucleus
Bohr worked to discover all of this, but keep in mind that he only worked with________________________!
Scientists began to wonder . . . if opposite charges attract, then why are negative electrons (that are
lighter) not pulled into the positive nucleus?????
Well . . . It all has to do with energy –____________________________________________!

Electrons actually “___________________” as they move around the nucleus
DeBroglie’s Wave Theory
DeBroglie proposed that ___________________________________________________ around the nucleus
_____________________________________________________________: it is impossible to know the
exact position of an electron (if they travel in waves)
The Quantum Mechanical Model
1. developed by ______________________________
2. atoms have a dense, positively charged __________________
3. electrons surround the nucleus and are___________________________________________, not particles
4. there is a GOOD probability of finding an electron in an _________________________________
*****an atomic orbital is a ________________________around the nucleus (it’s____________________)