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Unit 3:
Introduction to
Chemistry
What is chemistry?
The Atomic Theory
states...
1. All matter is made up of atoms.
2. All atoms of a given element are
identical.
3. Compounds are formed when
atoms of different elements
combine in fixed amounts.
4. An atom cannot be created or
destroyed, just rearranged in a
chemical reaction.
Fill this chart in as we go through the notes.
Atoms are
known as the
building
block of
matter.
They are
made of 3
subatomic
particles...
Subatomic
Particle
proton
neutron
electron
Charge
Location in
Atom
Atomic Mass in
AMU (atomic
mass unit)
Function
1,000,000
Carbon atoms make up width of 1 strand of human hair.
1 trillion atoms
500 years
to make one human cell
Amt. of time it would take you to
count the atoms in a grain of salt.
DID YOU
KNOW???
Atomic
Mass:
1 AMU
Function:
identify
element
Atomic
Mass:
1 AMU
Function:
give mass
Atomic
Mass:
< 1 AMU
(less than
1 AMU)
Function:
chemical
properties
Check your chart.
Atoms are
known as the
building
block of
matter.
They are
made of 3
subatomic
particles...
Subatomic
Particle
Charge
Location in
Atom
Atomic Mass
in AMU
(atomic mass
unit)
Function
proton
positive
(+)
inside the
nucleus
1 amu
identify
element
neutron
no charge
inside the
nucleus
1 amu
give it mass
electron
negative
(-)
outside of the
nucleus in
electron
orbits/levels
less than 1
amu
chemical
properties
Periodic TableArrangement of all chemical elements. Each element
represents one atom of the given element. The table is
arranged in order by increasing atomic number.
Atomic Number=
# of protons=
# of electrons
Remember: APE
Mass Number=
# of protons +
# of neutrons
Remember: MAN
4 Steps to
Determining
the Number
of Protons,
Electrons,
and
Neutrons
1. Look up the givens on the periodic
table: atomic number & mass number
(Hint: this is the decimal--round the
number to a whole number)
2. Fill in the number of protons and
electrons (Hint: same as the atomic
#)
3. Mass #- atomic #= # of neutrons
1. Check your math. A=P=E & the
protons & neutrons should=mass #