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19 July, 10:19

28. Magnesium bromide is a binary ionic compound. From its formula, MgBr2, how do you know that Mg is the metal? (Pages 567-568)

29. Element X has five valence electrons, element Y has one valence electron, and element Z has one valence electron. Which two of these elements are most likely to have similar properties? Explain your answer. (Page 503)

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  1. 19 July, 14:16
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    Explanation:

    28. In ionic compounds the metal is always at the left.

    MgBr2

    Cu (SO4) 2

    CaCO3

    FeO

    Li2O

    etc

    29.

    Elements from same group are more likely to have similar properties.

    Since Y and Z have one valence electron they are from the same group, therefore are more likely to have similar properties
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