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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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Answer:

See Below

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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