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Unit 21 - atomic structure
Atoms and elements
Atom mass and charges
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Cards (4)
An atom has the same number of
protons
and
electrons
, so the + and - charges balance therefore the atom has
no overall
charge.
Electron :
Charge =
-1
Mass =
0
Proton :
Charge =
+1
Mass =
1
Neutron :
Charge =
0
Mass =
1