Chem ! using the average atomic mass, calculate the number of atoms present in 1.2 ml of liquid mercury. (density=13.6g/ml)

So let's convert this amount of mL to grams:

Then we need to convert to moles using the molar weight found on the periodic table for mercury (Hg):

Then we need to convert moles to atoms using Avogadro's number:

So now we know that in 1.2 mL of liquid mercury, there are present.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.