Which element is the most electronegative in fluoride compounds?

• A. Oxygen
• B. Fluorine
• C. Nitrogen
• D. Neon

Answer: (B)

Fluorine has the highest electronegativity of any element, so in fluoride compounds it attracts shared electrons more strongly than the other elements listed. This strong pull comes from its very small size and high effective nuclear charge, which lets it hold onto electrons tightly and draw electron density toward itself in bonds. That makes bonds with fluorine highly polar toward fluorine and explains why fluoride compounds are dominated by fluorine’s electronegativity.

Oxygen and nitrogen are electronegative as well, but not as much as fluorine, so they don’t exceed fluorine in this context. Neon is a noble gas and typically doesn’t form bonds, so electronegativity isn’t a relevant factor there.