An atom of which of the following elements has the greatest ability to attract electrons?

The ability of attracting electrons of any element is called electronegativity of that element. Electronegativity is affected by both its atomic number as well as the distance between its nucleus and the valence shell electrons. The higher the value of electronegativity, more electrons get attracted. It is a dimensionless quantity, commonly referred to as the Pauling scale on a relative scale starting from 0.7 to 3.98.