Periodicity IV Fluorides and Oxides

The two most electronegative elements, fluorine from Group 17 and oxygen from Group 16, form binary compounds i.e. there are no other elements present) with almost all of the elements. The simpler compounds, e.g. usually those with only one atom of the other element, arc used in this study of the chemical periodicity of the elements. In addition, most of the oxides of the elements react with water to give either alkaline or acidic solutions, and this is an almost universal property that shows periodicity across the periods and down the groups of the periodic table. 

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The properties of element 118 shown in Table 24.2 are those predicted by Grosse [26] in 1965. These properties are obtained chiefly by extrapolation of known properties of lower homologs in the periodic table. Element 118 should be the most electropositive of the noble gases and should certainly exhibit positive oxidation states, such as iv, and should form fluorides and chlorides, and probably bromides and iodides, as well. 

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