Atoms of which element have the greatest tendency to gain electrons?

(1) bromine (3) fluorine

(2) chlorine (4) iodine

Fluorine.

Because: - Atoms want to become stable, for an atom to become stable, they need 8 valence electrons. Since Fluorine has 7 valence electrons, it only needs one more electron to become stable and have an octet. An octet is when an atom/element has 8 valence electrons. Since Fluorine will need to gain an electron, it will have a negative charge, and become an anion.

The best answer is fluorine