Final answer:
Chlorine (c) normally occurs as a diatomic molecule in elemental form.
Step-by-step explanation:
The element that normally occurs as a diatomic molecule in elemental form is chlorine (c).
Chlorine is a halogen, which belongs to Group 17 on the periodic table. In its elemental form, chlorine exists as a diatomic molecule with the formula Cl2, meaning that two chlorine atoms are bonded together.