PLEASE HELP!!! A student makes a graph of ionization energy using the periodic table.
Which claim is most supported by the trends in the periodic table represented in this graph?

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

What is the solubility-product constant of barium sulfate, baso4, if a saturated solution is 1.03 ´ 10-5 m?

2-bromo-2-methylbutane undergoes an e1 elimination reaction in the presence of ethanol. in the next reaction only one of the possible products is represented. although the product shown is not the major product of the reaction, notice that there is more than one way it can be produced. complete the mechanism and draw the missing substances.