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Chemistry Help!

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Shouldn't the electronic configuration be
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
Since the 4s orbital is filled before the 3d orbital
But the mark scheme says
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2
But i have been taught that 4s fills before 3d so which one is correct??
 
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View attachment 51705
Shouldn't the electronic configuration be
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
Since the 4s orbital is filled before the 3d orbital
But the mark scheme says
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2
But i have been taught that 4s fills before 3d so which one is correct??
Both answers are correct but your one is much better than of mark scheme, this is what i was taught.
 
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