Transcript Slide 1

Ch. 2.1 Matter
Atom = smallest whole unit of matter
10,000,000
atoms
How many can you fit in one mm?
½ of a flea
1 straight pin head
9 straight pin points
2000 bacteria
200,000 viruses
Nucleus
Electron -
Proton +
Neutron
Electron Cloud
Centrifugal Force
Centrifugal Force
CHEMICAL CONFIGURATION:
WHAT DO YOU KNOW?
Atomic
Number
Name
8
O
15.999
Oxygen
Symbol
Atomic
Mass
Atomic
Number
8 protons
8 electrons
Name
8
O
15.999
Oxygen
Symbol
+
Protons
Neutrons
Atomic
Mass
Neutrons = Atomic Mass – Atomic Number
Neutrons = 15.999 – 8 = 7.999
CHEMICAL CONFIGURATION:
HOW DO YOU USE WHAT YOU KNOW?
8
eeee-
O
eeee-
15.999
Oxygen
Electron Configuration Practice Worksheet.
O
.
..
O
.
..
The Happy Atom!
Once upon a time there was a very sad atomic nucleus
named Nuke. He had an empty space for one electron!
Level
He had space in his second level for 8 electrons. But,
one of his spaces was EMPTY!
The Happy Atom! (cont.)
One day Nuke met another atomic nucleus that had lots
of electrons.
But the other nucleus had an electron that was all alone!
The Happy Atom! (cont.)
So Nuke asked the other nucleus if his lonely electron
would like to live with Nuke and his electrons.
?
The other nucleus agree and the lonely electron
transferred to Nuke’s family.
The Happy Atom! (cont.)
Now the lonely electron was no longer lonely and
Nuke’s empty space was filled!
THE END ?
Everyone lived happily ever after.
Atom
Molecule
Compound
H
H2
H2O
Total of 11 e-’s
in 3 levels
Total of 17 e-’s
in 3 levels
BONDING
Ionic Bonding =
Male
transferring electrons
Female Bonding
Total of 10
e’s in 2 levels
Total of 18e’s
in 3 levels
NaCl = Salt
BONDING
Covalent Bonding =
sharing electrons
WATER IS COVALENTLY BONDED
H
O
6 neutrons
8 neutrons
Isotopes = same
number of
protons and
electrons, but
DIFFERENT
NUMBER OF
NEUTRONS.
Isotopes are
unstable and
breakdown at a
constant rate.
HRW: Chemistry for Biologists 21 min
FlashDrive: Half-Life: Dating 1:24