an element X has atimic number 19 predicts its valency by criss cross method1.chloride..2.bromide..3.iodine...4.hydroxide
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X=Potassium.1)k+ Cl- =KCl, 2)k+ Br- =KBr, 3)k+ I- = kI, 4)K+ OH- =KOH
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