8(i)
In the reactivity series of metals, Z is a metal above hydrogen and its oxide has the formula ZO. It was found that ZO reacted with water and formed a hydroxide as the product. With reference to the above context, answer the following questions:
(a) State the number of valence electrons present in element Z.
(b) Name the group which Z belongs to.
(c) What will be the formula of the hydroxide of Z?
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(a) The oxide has the formula ZO, so Z is divalent. Hence, Z has 2 valence electrons.
(b) Z belongs to Group 2 (alkaline earth metals).
(c) The formula of the hydroxide of Z is Z(OH)2.