Chapter 2, Problem 100AE

From the following list of elements—Ar, H, Ga, Al, Ca, Br, Ge, K, O—pick the one that best fits; each description. Use each element only once:

1. an alkali metal,
2. an alkaline earth metal,
3. a noble gas,
4. a halogen,
5. a metalloid,
6. a nonmetal listed in group 1A,
7. a metal that forms a 3 + ion,
8. a nonmetal that forms a 2 — ion,
9. an element that resembles aluminum.