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Why are the trends and exceptions to the trends in ionization energy observed?

For each of the following compounds, decide whether the compound's solubility in aqueous solution changes with ph. if the solubility does change, pick the ph at which you'd expect the highest solubility. you'll find ksp data in the aleks data tab. compounds does solubility change with ph

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)