Final answer:
The noble gas core ground state electron configuration for Mo3+ is [Kr]4d^5.
Step-by-step explanation:
The noble gas core ground state electron configuration for Mo3+ can be determined by finding the noble gas that precedes Mo (atomic number 42) in the periodic table. The noble gas core ground state electron configuration for Mo3+ is [Kr]4d^5. The noble gas that precedes Mo is Kr (atomic number 36), so the noble gas core ground state electron configuration for Mo3+ is [Kr]4d5.
The noble gas core ground state electron configuration for Mo3+ is [Kr]4d^5. This means that the core electrons of Mo3+ are represented by the electron configuration of Kr (1s22s22p63s23p64s23d10) and the valence electrons are represented by the electron configuration of Mo (4d5).