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Chemistry
Paper 1
Isotopes & relative atomic mass
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Isotopes
are different forms of the same element that have the same number of
protons
but different number of
neutrons
Because isotopes have different number of
neutrons
different isotopes will have different
masses
Relative atomic mass is the calculation of the
average
mass of all the
isotopes
that make up an element
Isotope abundance is how common or rare the
isotope
is
Relative atomic mass equation
Sum of (
isotope
abundance
x
isotope mass
) / sum of abundance of all isotopes
Relative atomic mass symbol is Ar
The symbol for an
isotope
is the
chemical symbol
(or word) followed by a dash and then the
mass number
So, C-14 is the isotope of carbon which contains 6
protons
and 6 electrons, but the 14 signifies that it has 8
neutrons
(14 - 6 = 8)
6 is the number of protons
It can also be written as
14C
Isotopes
display the same
chemical
characteristics
This is because they have the same number of
electrons
in their outer shells, and this is what determines their
chemistry
isotopes hydrogen
Structure
of isotopes hydrogen
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