DO NOW!
(On the back of the blank atom model.
Write the ? And answer
 If an atom has five protons and four electrons, the atom is
a. neutral
b. radioactive
c. negatively charged
d. positively charged
DO NOW!
(On the back of the blank atom model.
Write the ? And your answer
In Rutherford’s experiment, what caused some high-energy
particles to bounce off the metal, while most pass straight
through?
A. Light waves
B. Magnetic waves
C. Positive charges
D. Negative charges
Elements, Compounds, and
Molecules
Atom
FORMULA FOR DECODING ATOMIC
INFORMATION?:
A=P=E M-P=N
OR
(M=P+N)
(A=P=E)
Atomic # = #protons = #electrons
(M-P=N)
Mass# - #Protons = #Neutrons
OR
(M=P+N)
Mass# = #Protons + #Neutrons
Your turn!
 Using the strategies on the last slides, use the
blank atom model to fill in an atom that has 11
Protons, 12 neutrons, and 11 electrons.
 Using the periodic table, what is the name of
the element you just labeled?
 Hint- Atomic #= # of protons= # of electron
Molecules
 Molecule- A molecule is formed when two or more atoms are
chemically bonded together. All compounds are molecules but not
all molecules are compounds.
EXAMPLES:
H2O2
Compound & Molecule
H2O
Compound & Molecule
H2
C60
Molecule
Molecule