134. Consider the following idealized PES spectrum for an element: Relative number of electrons
1000
100
1
0.1
10
Energy (MJ/mol)
What is the identity of the element?

Ineed with this also i hope you understand it

They make up examples of physical properties 

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).