You're right. Pure metallic mercury would sink right to the bottom of the lake and beyond. Only methyl mercury is dangerous when it finds a body of water.
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Except for the fact that most of the metallic mecury would then react and turn into methyl mercury, Mr. Chemistry Ph.D.
Here's my source in case you still think me full of it.
First what you quote is not a SOURCE. It's something you found on a google search. I have had low levels of mercury in my blood from the work I do, you would have to EAT considerable quantities of meatllic mercury for even detectable amounts to dissolve. You are patently wrong what you quote as a source is a source for a layman. again, neurotoxcicity is primarily from organic mercury compounds NOT metallic mercury.