O Bromine
Explanation:
The element that will attract electrons in a chemical bond is Bromine.
An element that attracts electrons in chemical bonds is said to be an electronegative element.
Such an element have a relative tendency to attract valence electrons in a chemical bond.
The most electronegative group on the periodic table is that of the halogens. Halogens are a special class of electronegative elements. They need just one electron to complete their octet, hence the reason for their electronegativity. Metals are electropositive and are not ready to attract electrons. They prefer reactions where they can lose electrons.