#[Ar]4s^2 3d^10 4p^4# is the noble gas configuration of which element?
That's not a noble gas configuration. That is, however, a noble gas shorthand for the electron configuration of selenium.
Notice how the number of electrons corresponds to the number of protons in a neutral element. Thus, if you start from the
In fact, the noble gas portion of the configuration represents the core electrons of the unidentified element. Therefore, everything after it is non-core (the
Again, since the number of electrons equals the number of protons in a neutral element, and there are two
#18 + 2 + 10 + 4 = 34#
total electrons in the element, which correspond to