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Transcript 
Atoms: Atomic Structure Notes
Atomic Structure: Arrangement and
number of sub-atomic particles.
• Protons- Are located in the nucleus
• Neutrons- Are located in the nucleus
• Electrons- Are located in the nucleus
Nucleus
Center of core of an atom.
Contains 99.9% of the weight of an
atom.
Contains protons and neutrons.
Occupies 1/100,000 of the space of
an atom.
Protons
Positively charged subatomic particles.
Found in the nucleus.
All protons are alike.
Weight of 1 proton = 1 atomic mass unit
(amu).
Neutrons
Neutrally charged (no charge) subatomic
particle.
Atomic weight is 1 amu.
Found in the nucleus.
What Makes atoms different?
The number of protons in
the nucleus.
(If you change the number of Protons, you
change the element.)
Atomic Number
Atomic number is the number of protons in
an atom.
All atoms of a particular element have the
SAME number of protons.
In a neutral atom, the number of protons =
the number of electrons.
What is a neutral atom?
Neutral atoms have no overall charge.
# of protons = # of electrons.
How many electrons?
Copper (Cu) has an atomic number
of 29.
How many electrons does it have?
29
Atomic Mass
Also called atomic weight or mass number.
Sum (total) weight of protons and neutrons
in an atom.
In a neutral atom, the # of protons = the #
of electrons
Calculating Neutrons:
Mass number = protons + neutrons
Neutrons = mass number – protons
How many neutrons does Copper have?
Mass # = 63.546 (rounds to 64)
Neutrons = _____ - ______ = _______
Neutrons =
64-29=35
Periodic Table
Atomic number
Symbol
Atomic Mass
(Mass Number)
Isotopes
Atoms of the same element with different
numbers of neutrons
Electrons
Negatively charged subatomic particle.
Weight = 0.0006 amu.
Moves rapidly.
Form an electron cloud
(area where electrons are likely to be)
Ions
Charged atom.
Number of protons does not
equal number of electrons.
(add this on your paper under Electrons)
Electrons in Energy Levels
A= Atomic #
P= # of Protons
E= # of Electrons
M= Mass #
A= Atomic #
N= # of Neutrons
A=P=E
M-A=N
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