Answer
Please see the work below.
Work Step by Step
The chemical similarities of Sodium and Potassium.
1) Both form ionic compounds.
2) Both form basic oxides.
3) Both of them react vigorously with water forming their hydroxides.
The chemical similarities of Chlorine and Bromine.
1) Both form hydrogen halide with hydrogen gas.
2) Both form acidic oxides.
3) Both of them react with metals to form their corresponding halides.
