Please help me plz

Using the periodic table, determine which material is most likely a good conductor

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?