Mendeleev’s 1871 periodic table included oxide formation as an organizing feature.  The ratio in which an element will combine with oxygen is related to the ions that the element commonly forms.  For example, lithium forms the Li+ ion easily (because it has a low first ionization energy, but high second ionization energy).  Oxygen forms O-2  ions easily (because it has a high electron affinity for two electrons).  Thus, Li+ and O-2 combine to form Li2O to become a neutral molecule. Based on this reasoning, which of the following would be the formula for magnesium oxide? Mg2O2   MgO   MgO2   Mg2O

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A:

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