1) All of the common noble gasses are monotomic and low boiling. Their boiling points in degrees celcius are: Ne, -245; Ar -186; Kr -152; Xe -107. Using the Periodic Table, predict as best you can the molecular formula and boiling point of radon, Rn, the only radioactive element in this family.

______________ ____________`C

2) Substances A, B, and C can all act as oxidizing agents. In solution, a is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A^-, B^-, and C^- ions, all of which are colorless. When a solution of A is mixed with one containing C^- ions, the color changes form green to red.

Which species is oxidized?
Whis is reduced?

When a solution of A is mixed with one containing B^- ions, the color remains green.

Is A a better oxidizing agent than B?
Is A a better oxidizing agent than C?

Arrange A, B, and C in order of increasing strengths as oxidizng agents.

3) You are given an unknown, colorless, solution that may contain only one salt from the following set: NaA, NaB, NaC. In solution each salt dissociated completely into the Na^+ ion and the anion A^- , B^- , or C^- , whose properties are given in problem 2. The Na^+ ion is effectively inert. Given the availability of solutions of A, B, and C, develop a simple procedure for identifying the sal that is present in your unknown.