Which atom attracts electrons more strongly?

cesium (Cs)

bromine (Br)

Which atom loses an electron more readily?

sodium (Na)

chlorine (Cl)

Bromine attracts electrons more strongly. Cesium is In fact the least electro negative element.

Sodium is more likely to lose an electron because is is less electro negative. Strong electronegativity make the element want more electrons. Sodium has loose electrons with a lower electronegativity so it gives it up easier.