what is electronic configaration of arscenic atomic number 33, in its excited state ?

Dear Student

Arsenic, As
Atomic number = 33

Electronic configuration is 1s² , 2s², 2p⁶ , 3s^​2 , 3p⁶ , 4s² , 3d¹⁰ , 4p³ 
Or, [Ar] ​4s² , 3d¹⁰ , 4p³

Now, in the excited state, the electronic configuration would be -
1s² , 2s², 2p⁶ , 3s^​2 , 3p⁶ , 4s² , 3d⁹ , 4p⁴ 

In this case, one of the electrons from 3d has moved to more energetic 4p level.

Regards