why does the building of atom the filling 4s orbital takes place before 3d
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Explanation:
During the filling of an atom the electrons arrange themselves according to the increasing energy orbitals. This is aufbau principle.
the energy of an orbital is directly proportional to the sum of the principle quantum no. and azimuthal quantum no.
the sum of n and l of 4s is 4
the sum of n and l of 3d is 5
therefore the electrons will first fill in less energy orbital i.e. 4s and then in higher energy orbital i.e. 3d
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