Answer
a.) Se (most electropositive), S, O (most electronegative)
b.) Na (most electropositive), P, CL (most electronegative)
c.) S (most electropositive), Cl, F (most electronegative)
d.) P (most electropositive), N, O (most electronegative)
Work Step by Step
Electronegativity increases as you go across the periodic table (going to the right) excluding the noble gases. It decreases as you go down the periodic table since the atomic radius increases. Use a periodic table as reference.
