isotopes
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where is most of the mass in an atom stored
in the nucleus
what does the top number on an element in the periodic table mean
mass number
what does the bottom number on an element in the periodic table mean
atomic number - number of protons and therefore number of electrons too
what are isotopes
atoms with the same number of protons but different numbers of neutrons, they therefore have different masses
can different isotopes of the same element can have different physical properties
yes
can different isotopes of the same element have the same chemical properties
yes, they always do. this is because their reactions depend on their electron structure which will remain the same
what is the size of an atom
0.1 nm
what property can isotopes have
be radioactive