How do you work out the charge of sulphate

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

Which of the following electromagnetic waves can create ions?