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Key concepts in chemistry
Atomic structure ⚛️
Atomic & mass number + isotopes
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What
is atomic number?
The number of
protons
in an atom's
nucleus.
What
is mass number?
Total number
of
protons
and
neutrons
in an atom.
What are isotopes?
Isotopes are
atoms
of the
same element
that have
different numbers
of
neutrons.
What is
relative atomic mass
?
The average mass
of
one atom
of the element compared to
1/12
of the mass of one atom of
carbon -12.
What
is the formula to work out relative atomic mass from
isotopic
abundances?
relative atomic mass
(Ar) = sum of (isotope abundance x isotope
abundance)
÷
sum of abundances of all isotopes.
