Which of the following are characteristics of the transition elements in general?

1. Unlike other elements, the sulfates of these elements are soluble in water.
2. The outermost 's' orbital is always full.
3. Form coloured compounds.
4. Almost all compounds are white.
5. Frequently used as catalysts.
6. Most have incomplete 'd' orbitals.
7. The outermost 'p' orbital is partially completed.
8. The oxides and hydroxides of these elements tend to be soluble in water.
9. These elements almost all show a number of different oxidation states.