Question

Witch of the following hydroxides can form hydroxide salt:

a. barium hydroxide

b. potassium hydroxide

c. rubidium hydroxide

d. aluminium hydroxide

e. bismuth (III) hydroxide

f. iron (II) hydroxide

I've been given the answers to this question. They say a, d, e and f can form a hydroxide salt, but my question is why? Can you just explain it to me?
IT IS URGENT

Answer 1

this all happens due to the outermost shell or valanced shell electrons

in b,c the valency and the valence electrons are 1 as they belong to group 1 in periodic table.

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