in an atom which has 2k 8l 18m
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Answer is C - 7
If you add all electron it become 30, and 30 electrons contain Copper atom which has an exceptional electronic configuration i.e
1s2 2s2 2p6 3s2 3p6 4s1 3d10
For zero magnetic quantum number, the value of azimuthal quantum no. Should also be zero, and it is zero for
1s2 2s2 3s2 and 4s1, means totally for 7 elections.
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