protons, neutrons, electrons

1. Calculating
Subatomic Particles

2. What are subatomic
particles?

3.  Protons (+)
 Neutrons (Neutral)
 Electrons (-)

4. How do we determine how
many protons, neutrons and
electrons an atom of a
certain element has?

5.  # of protons = the atomic number
 # of electrons = the # of protons
 # of neutrons =
atomic mass – atomic number
(rounded)

6.  Example:
 Gold
 # of protons?
79
 # of electrons?
79
 # of neutrons?
197-79 =
118

7.  Example:
 Potassium
# of protons?
19
# of electrons?
19
# of neutrons?
39 -19=
20