Final answer:
The chemical formula for fluorine in its standard state is F₂, which is a diatomic gas due to fluorine's high electronegativity.
Step-by-step explanation:
The chemical formula for fluorine in its standard state is F₂. Fluorine is a diatomic molecule, meaning it naturally pairs up with another fluorine atom to form a molecule in its most stable and common form, denoted as F₂ gas. Rule 3 of assigning oxidation states is vital for fluorine due to its strong electronegativity, which is the highest among all elements. Thus, the F-F molecule can provide a reference point for calculating oxidation states of other elements.