Final answer:
Iodine is diatomic, a halogen, and a solid at room temperature. The incorrect statement is that it is a noble gas, which it is not since noble gases are monatomic and iodine is diatomic.
Step-by-step explanation:
The statement that is NOT true of molecular iodine, I2, is C. It is a noble gas. Molecular iodine is indeed a diatomic molecule (A), meaning it consists of two iodine atoms bonded together. It is also a member of the halogen group in the periodic table (B), which is group 17 and includes elements like fluorine, chlorine, bromine, and astatine. As for its state at room temperature, iodine exists as a solid (D), characterized by a dark purple-gray color. Unlike noble gases, which are monatomic and do not form diatomic molecules, iodine does form diatomic molecules and has stronger dispersion forces due to its larger number of electrons and higher molecular mass, leading to its solid state at room temperature. The noble gases, in contrast, are all monatomic gases at room temperature.