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As when forming a hydroxide the ion OH is used in this manner

Metal(OH)valence of metal
does that mean that if my valence is 2 as with calcium,i have 2 molecules of oxygen and two of hydrogen??

2 answers

actually, no.
M(OH)2

it means you have two hydroxide ions, consisting of 2 O atoms, and 2 H atoms, which are bonded as OH- in a covalent bond, a rather strong bond.
Also, sum of valence values must = 0... Ca^+2 + 2(OH^-) => 1(Calcium Ion Valence) + 2(Hydroxide Valence, or net charge) = 1(+2) + 2(-1) = 0 and combination of elements constitute a correct formula ratio.