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equation for relative atomic mass=
sum of (isotope abundances x isotope mass)/100
what is an isotope?
different forms of the same element that have the same number of protons but a different number of neutrons
what is abundance?
how common or rare that isotope is shown as percentages/100
what is relative atomic mass?
average mass of all isotopes that make up an element
what sub-atomic particle determines the chemical properties of an element?
the electron
what sub-atomic particle that determines what element it is?
the proton
what is the structure of an atom
a central nucleus comprising of protons and neutrons with electrons orbiting the nucleus in shells
what is the size of the atom?
0.1 nanometers
what is the size of the nucleus of the atom?
it is 1/10,000 of the atom
what is the relative charge of a proton?
+1
what is the relative charge of an electron?
-1
what is the relative charge of a neutron?
0
what is the relative mass of a proton?
1
what is the relative mass of an electron?
1/2000 or very small
what is the relative mass of a neutron?
1
Note 
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