Final answer:
The noble-gas electron configuration for titanium is [Ar] 4s² 3d².
Step-by-step explanation:
The noble-gas electron configuration for titanium is option c) [Ar] 4s² 3d². The electron configuration for an atom represents how the electrons are distributed among the atomic orbitals. In the case of titanium, the symbol [Ar] represents the electron configuration of the noble gas argon, which comes before titanium in the periodic table. The 4s² represents the two electrons in the 4s orbital, and the 3d² represents the two electrons in the 3d orbital.