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Physical Chemistry
1 Atomic Structure
Three sub-Atomic particles and isotopes
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Protons
are found in the
nucleus
and have a relative mass of of
1
and a relative
charge
of +1
Neutrons are found in the
nucleus
and have a relative mass of
1
and have a charge of
0
Electrons are held by orbitals and they have a relative mass of
1/1836
and a relative
charge
of
-1
Mass number
is
protons
and
neutrons
added together
Atomic number is the total number of
protons
in the nucleus of an element
The number of
electrons
is the same as the
atomic number
The number of neutrons can be calculated by doing the
mass number
minus the
atomic number
Isotopes
are atoms with the same number of
protons
but different number of
neutrons
Isotopes
have similar chemical properties because they have the same
electronic structure
which means they react with things in the same way
Isotopes
may have slightly varying physical properties (e.g
density
) because they have different masses
Isotopes
have the same
atomic number
but a different
mass number
Why do
isotopes
have similar chemical properties?
They have the same
electronic structure
Why do
Isotopes
have different
chemical properties
?
They have different
masses
