Please answer this question :

Please answer this question : After np orbitals are tilled. the next orbital tilled Will be

Dear student,
After the filling of np-orbitals, the (n+1)s orbitals are filled next. As per Aufbau principle, orbitals are filled in order of increasing value of (n+l). If two orbitals possess same (n+l) value, then orbital having lower value of n is filled first.
Further you can refer to the following image for the trend
Image result for after np orbitals are filled, next orbital to be filled is


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