Download U1-05N Subatomic Particles

1P1
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Subatomic Particles
The atom is composed of 3
neutrons
,
electrons and
. The following table summarizes their properties.
subatomic particle
Standard
subatomic particles, protons
mass (a.u.)
charge
notation is a simplified way of identifying
symbol, atomic number
and atomic mass
neutrons and electrons in an atom can be found
location
atoms. It includes the atom’s
. The number
of protons,
with standard notation
12
C
6
# of protons
=
# of neutrons =
# of electrons =
19
F
9
# of protons
=
# of neutrons =
# of electrons =
# p+ = atomic number
# n0 = atomic mass - atomic number
# e- = # p+
.
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standard notation element name
An atom is neutral
# protons (+)
# electrons (-)
because the number of electrons equals
of protons. Chemical reactions cannot
and become negatively
9p+
10no
the number
change the number of protons
atom, but they can change the number of electrons
19
F
9
# neutrons (o)
. Some atoms gain
in an
electrons
charged ions.
19 F
9
9p+
10no
gains one electron
Other atoms lose
7
Li
3
electrons to become positively
charged ions.
7 +
Li
3
3p+
4no
3p+
4no
loses one electron
Homework
Read pg. 210 Do Q #1-3 pg. 217
Complete Subatomic Particle Worksheet