if the K and L shells of an atom are full and the M shell has 2 electrons then what is the atomic number of the atom.
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18 is the atomic number of the atom.
[because k shell has 8 electrons.L shell has 8 electrons.so 8+8=16.now M shell has 2 electrons so 16+2=18]
The number of electrons is equal to the number of protons
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