physics

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1 atomic structure

1 isotope

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~ATOMIC STRUCTURE~

nuclide notation = nucleus of the atom

a - mass number (protons + neutrons)

X - to find neutron number: mass number-atomic number)

z - proton number (atomic number) and (if neutral) electron number

eg:

234 protons: 92

U neutrons: (234-92=) 142

92 electrons: 92

~ISOTOPE~a variation of an element