The weight of one bacterium is incredibly small and varies depending on the species. However, we can give you a general idea:

* Average weight: A typical bacterium weighs around 1 picogram (pg).

* Range: The weight can range from 0.1 to 10 picograms depending on the size and composition of the bacterium.

To put this in perspective:

* 1 picogram is one trillionth (10^-12) of a gram.

* It would take approximately 1 trillion bacteria to weigh 1 gram, which is about the weight of a paperclip.

So, while a single bacterium is extremely light, their collective weight can be significant, especially when they are present in large numbers.