Is the given ground state configuration 1s2 2s3 2p3 possible , why or why not ?

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Explanation: 

1s2 2s3 2p3 no this ground state configuration is not possible because in this configuration 2s orbital is having 3 electrons which is not possible since s subshell can have maximum 2 electrons .

Answer: 

no this ground state configuraton is not possible since s can have only maximum 2 electrons .