1, 2, or 3...help please

Using the periodic table, complete the table to describe each atom. type in your answers

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

Will mark brainliest how many electrons can be held in the energy level n = 4?