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ATOMIC THEORY REVIEW
ATOMS !!! What are the 3 subatomic particles?
Protonsneutronselectrons
What is ALL matter made of?
What are the charges of the subatomic particles?
protons (+)positive
neutrons (0)neutral
electrons (-)negative
We know that there are the same number of p+ and e- in atoms on the Periodic Table… So What is the overall charge of any atom?
The overall charge of any atom is
NEUTRAL… the positive charge cancels out the negative charge = 0!!!
What are the masses (amu) of the subatomic particles?
p+ = 1amu
n = 1amue- = 0 amu
1.66 x 10-27 kg = 1 amu
What is this AMU stuff?????
Atomic mass unit (AMU)
2.2 lbs= 1 kg
What are the two areas of an atom?
Nucleus and electron cloud
Where are the p+, n, and e- located in an atom?
p+ in the nucleus
n in the in nucleus
e- in the electron cloud
NucleusWhere is ALL the mass in an atom located?
Where is most of the volume of an atom located?
Electron Cloud
The nucleus contains the p+ and n… while the electrons “orbit” the nucleus in the energy rings of the e- cloud.
What does a Bohr model of the atom look like?
Click icon to add picture
So what are the charges of the different areas?
1. So what is the overall charge of the nucleus?
Positive
2. So what is the overall charge of the electron cloud?
Negative
QUICK REVIEW- ATOMS
Sub-atomic particles:.
particles charge amu location abbrev.
Protons
Electrons
e-
Neutral (0)
+ p+nucleus
0
1
1
neutrons
Electron
cloud_
nucleus
no
protons, neutrons, and electronsnucleus and electron cloudParts of the atom:
Energy Levels of the Atom
8 e- 2e- 32e-
8 e-
18 e-
18 e- 32e-
The Nucleus
P+ N0
1st
shell7th
shell2nd
shell3rd
shell4th
shell5th
shell6th
shell
Atoms can have several energy levels. Sometimes they are also called energy rings, shells or orbits.
Lets take a look at the Periodic Table!
Burning Hindenburg
Burning Hindenburg
Bohr Model Practice1. H
2. Be3. Na4. K5. Rb
6. He7. F8. Cl9. Br10. I
More Bohr Model Practice1. Fr 2. Te3. Sn
4. Cs5. Kr
6. At 7. Ga8. Rn9. Ag10. W
What Bohr model patterns are you starting to see develop? Periodic Table Patterns
The atomic number is the same number as the number of protons and electrons.
Atoms get larger as you move down and two the right on the periodic table.
As you move from left to right on the periodic table, you gain protons and electrons and neutrons.
As you go down from the periodic table, the atom gains another energy shell or orbit.
Valence ElectronsValence electrons are electrons in the
outermost shell of an atom. They determine whether the atom will
bond with another atom.How many valence electrons does lithium have here?
1 valence electronCircle the valence electronsFrom your warm up.