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Transcript 
There are three states of matter: gas,
solid and liquid
All matter is made of atoms
An element is made up of one type of
atom
A molecule is a combination of two or
more atoms. (They can be the same
element or different elements)
• All atoms have a central part called a
nucleus
• The nucleus is made up of two structures,
protons that have a positive charge and
neutrons which have no charge
• Orbiting around the nucleus are structures
called electrons. They carry a negative
charge. They are the smallest of the three
structures
• Most atoms have the same number of
electrons and protons
Atom
Protons
Nucleus
+
Electrons
Neutron
(neutral)
Periodic Table
Atomic
Number
2
Symbol
He
4.0
Helium
Atomic Weight
Element Name
Periodic Table
The atomic number represents the number of electrons and protons
Atomic
Number
2
The number of
neutrons is
calculated by
subtracting the
Atomic number
from the Atomic
Weight
4-2 = 2 neutrons
in a Helium atom
Symbol
He
4.0
Helium
Atomic Weight
Element Name
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