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)

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

this is poiselle's equation from fluid mechanic in physics. mech eng

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