Electron Cloud notes
Download
Report
Transcript Electron Cloud notes
Which
atom
best
represents a
Carbon
atom?
Warm up
Electron Cloud
It’s a small world after all
PLEASE!!!!
Do not sing this terribly annoying song
The electrons swirling around the nucleus
of an atom are called the electron cloud.
This ‘cloud’ contains all the electrons in a
given atom.
Valence
electrons
The electron cloud has different energy levels
that electrons must follow in, called electron
shells.
We will only look at the first three.
The following shells can hold:
1st shell-Up to
2 electrons
2nd shell- up to 8
electrons
3rd shell- up to 18
Electron cloud
Vocab:
Valence electrons:
Electrons on the
outermost shell of
an atom.
So how many
valence electrons
do these atoms
electrons have?
Valence
model- a simple version of a more
complicated system or concept. Models
make something easier to understand.
Models
Just label the shells
The Bohr modelshows ALL the
electrons, protons,
and neutrons in an
atom.
Draw in IAN
The Bohr Model
Scientist use a more simple way to
represent atoms and their valence
electrons than the Bohr model.
An electron dot diagram shows ONLY the
valence electrons of an atom and its
name.
Next, draw the same carbon atom using
the electron dot diagram.
Electron dot diagrams
Draw in IAN the C (Carbon atom) and draw an
arrow to the valence electrons.
Bohr model
Electron Dot model
Bohr model vs. Electron dot
Vocab:
Rule of eight- all atoms want to have 8
valence electrons to fill up their outer
shell.
The atom will do whatever it can to make
the rule of 8.
This is a perfect time to introduce
the atoms rule of eight
The atom will give valence electrons away
or steal from other atoms to make their
outer shell have 8 electrons.
Electrons, not money---->
This is a perfect time to introduce
the atoms rule of eight
An atom reacts with another atom based
on its # of valence electrons. (electrons
on the outer shell)
An atom is unstable and wants to react
because of its # of valence electrons.
EVERY chemical reaction happens because
# of valence electrons
This ‘stealing’ and ‘sharing’ is how ALL
reactions happen!!!
Lets do this on the board!!!!!
Another
example.
The electron is
stolen by the Cl
atom and the
Na atom wants
to get rid of it
Why?
Remember those things called
ions!