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Name ___________________________________________ Date ___________________ Period __________
NOTES: The Atom - Fill in the blanks as you go over the notes in class.
Definition: Atom
The smallest ___________________ into which an __________________ can be divided and still maintain
the ___________________ of that element.
Atomic Theory:
 All _____________________ is composed of atoms.

The atomic theory describes the __________________, __________________ and other properties of
the atom and its component ___________________.
Atoms are made up of even smaller particles called:
1. __________________________ 2. __________________________ 3. __________________________
Protons:
 ______________________ charged

Located in the _________________ of the atom

All protons are ___________________
Neutrons:
 Neutrons have no __________________________________, they are ______________________

Also located in the ____________________ of the atom

All neutrons are ________________________
Electrons:
 ________________________ charged

Located ________________________ the nucleus of the atom

All electrons are ________________________

The number and arrangement of the electrons in an atom determine its ____________________________

Electrons travel in random paths in areas around the nucleus called _______________________________
Atomic Structure:
 __________________ and __________________ stick together to form the atom’s _________________.

Electrons are found in the _________________ surrounding the _____________________.

Protons and electrons are __________________ in charge but __________________ in sign.

Since unlike charges ________________ each other, electrons and protons exert an attractive electrical
force on each other. That’s what holds __________________ to the ___________________.
Atoms and Elements:
 Different kinds of atoms are called ________________.

An atom is identified by the number of ___________________ in its nucleus
o Example: an atom of Hydrogen has ______ proton, an atom of Oxygen has ______ protons
o All atoms of the same __________________ have the _________________ number of protons

Each atom has the same number of protons as _____________________ because there must be an equal
number of positive and negative charges—the atom is always _____________________.
o Example: If an atom has 12 protons, how many electrons does it have? _________
Molecules or Compounds:
 When two or more atoms combine, they form a ________________ also known as a ________________.

Most ___________________ are made out of _________ or more atoms of ________________ kinds
(different elements).
o For example, a _____________ molecule (H2O) is made of two ______________ atoms (H) and
one _________________ atom (O)
o Each molecule of water behaves like _______________. If the molecules are _______________
into separate _______________ and ________________ atoms, however, the particles no longer
______________ like water.
Wrap It Up: Atomic Particles
Particle
Proton
Neutron
Electron
Relative Mass
Charge
Location in Atom