The arrangement of the alkaline earth metals from the lowest to highest electronegativity is; Ba< Sr< Ca<Be
Electronegativity refers to the ability of the atoms of an element in a compound to attract the shared electrons of that bond towards itself. It is a property that decreases down the group but increases across the period.
Electronegativity increases across the period as atoms of elements become smaller in size and decreases down the group because of increase in distance between the valence electrons and nucleus.
Since electronegativity decreases down the group, the order of electronegativity from lowest to highest is; Ba< Sr< Ca<Be
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