Which of the following is true of the inner transition metals?

Many are radioactive.
They are all of great importance commercially.
They are all made only in the laboratory.
They are all synthetic.

What is the thermodynamic driving force for dissolving a solid in a liquid if it is an endothermic process (which reduces the entropy of the surroundings)? 1. the combustion of propane. 2. the increase of the entropy of the system. 3. increased temperature of the system and surroundings. 4. the decrease of the entropy of the system. 5. the increase or decrease of the entropy of the system?