Which is the most metallic element in the following: Fluorine - Gallium - Mercury - Iodine?

Fluorine and Iodine are obviously halogens and are non metallic.

Gallium has a figure in the ECS of -0.5 volts. Mercury is +0.8 volts. So Gallium is the more reactive metallic entity.

Mercury

Hello again Frances!!!

Since fluorine and iodine are both non-metals they can immediately be excluded.

Since gallium is a poor metal, it can also be excluded.

Therefore your best answer there is Mercury =)

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Hope this helps you!! =D

Metallic character is related to the electronegativity or electropositivity of element.

Greater is electronegativity lesser is metallic character

F has highest electronegativity of 4.0

I has electronegativity = 2.66

Hg has electronegativity = 2.0 and

Ga has electronegativity = 1.81

So Ga is most metallic