Which of the following elements will attract the most electrons in a bond? F, Br, or Cs.
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This is based on the electronegativity of an element.
Electronegativity is therefore the strength with which an element can attract a shared pair of electrons towards itself.
As it is a property and not an actual quantity, it has no units.
Electronegativity usually decreases down the group and increases along a period. Among all elements, Fluorine has the highest electronegativity. As we go down the halogens, it gradually decreases. So,
F > Br
Cs being a metal, has more tendency to donate an electron than to share. It is an alkali metal so it is extremely reactive and readily gives an electron to fluorine. So, its capacity to attract shared pair of electrons is quite low. Therefore, Cs is electropositive.
F > Br > Cs
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