To determine which element is most likely to form a strong ionic bond and take on electrons, we should consider the electronegativity values of the elements listed:
- Helium (He): Noble gas with a complete valence shell, generally does not form bonds.
- Cesium (Cs): An alkali metal with low electronegativity, tends to lose electrons to form positive ions.
- Fluorine (F): Has the highest electronegativity of all elements, making it very likely to attract electrons and form strong ionic bonds.
- Hydrogen (H): Has moderate electronegativity, typically forms covalent bonds rather than ionic bonds.
Given this information, the element that is most likely to form a strong ionic bond and take on electrons is fluorine (F).