Final answer:
Strontium (Sr) has a valence shell electron configuration resembling that of krypton, as it follows the noble gas with two additional electrons in the next available s orbital.
Step-by-step explanation:
An element that has the same ground state valence shell electron configuration as krypton (Kr), which has a noble gas configuration, would have eight valence electrons and no electrons in higher energy orbitals. Krypton has a configuration of [Ar] 3d³ⁱ⁰ 4s² 4p⁶, indicating that the last electrons fill the 4p orbital. Thus, we're looking for an element with a completely filled valence shell similar to Krypton's configuration, but with a different core. For example, strontium (Sr), with an atomic number of 38, has a configuration of [Kr] 5s², indicating it has two electrons in the 5s orbital, following the completely filled configuration of Krypton.