What charge would each element obtain when it becomes an ion? a) aluminum b) lithium c) barium d) bromine e) lodine f) phosphorus g) sulfur h) magnesium

The air is going to come out because of the low pressure.

The second and last option are the answers

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).