I assume you're talking about fluorine. Fluorine is in the halogen family and it belongs to group number 17.
Answer:
Ar 3d3 4s2 is the electron configuration for Vanadium.
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PH indicators detect the presence of H+ and OH-. They do this by reacting with H+ and OH-: they are themselves weak acids and bases. If an indicator is a weak acid and is coloured and its conjugate base has a different colour, deprotonation causes a colour change.
