Atoms Notes
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An atom is the________________________________ that an
element can be divided and still maintain the ________________
of that ________________
Atoms are the ___________________________ of matter
1 penny contains about 2 x 1022 atoms
Atoms consist of the following subatomic particles:
______________________________
______________________________
______________________________
What’s inside an atom? – Draw the ATOMIC STRUCTURE in the
space below 
Protons 
•_____________________ charged
•Located in the ____________________________
•Mass = __________
•An atom is identified by the________________________it contains.
•All atoms of the ___________________________have the
_____________________________________.
– Ex: Hydrogen atoms all contain 1 proton
Neutrons 
 ____________________; _____ charge
 Located in the _________________________
 Mass = __________
Electrons 
 _____________________ charged
 They orbit around the _______________ in
______________________________________
 Mass = __________
 Their __________ is MUCH _______________ than protons or
neutrons
Atomic Number 
____________________________________________________________
____________________________________________________________
____________________________________________________________
____________________________________________________________
Nucleus 
•The nucleus contains __________________and ___________________.
•The nucleus is the ____________, ____________, __________________
charged ______________ of the atom.
•It contains _______________________________________of the atom.
•The nucleus is ________________ compared to the rest of the atom.
6
C
Carbon
12.0
Atomic Mass 
____________________________________________________________
____________________________________________________________
____________________________________________________________
6
C
Carbon
12.0
Ions 
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Usually atoms have the same # of ____________________ &
____________________
– Atoms gain & lose __________________ (NOT
__________________!)
– If the # of electrons vs. protons is not the same, the atom is
charged & is called an __________________
– # Electrons > # Protons = ____________________ Charge
– # Electrons < # Protons = ____________________ Charge
Isotopes 
Isotope = atom that has the ___________________________but a
different _____________________as other atoms of the
___________________________
Isotope Notation – Write the _________________ of the element first.
Write the _________________ at top, left
Write the _________________ at bottom,
left
C
Carbon 12