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Potassium
The element is potassium. The animal is 'possum (actually spelled opossum).
an isotope of the element helium is obtained.
Sulfur
Not really.
Eat it.
you can not do it
No, you cannot remove a rock on Animal Crossing. The rocks in your town are there to stay, and in no point in the game can they be removed.
How difficult it is to remove an electron.
You can't remove rocks from your town.
You can't remove boulders and rocks from Animal Crossing Wild World DS unless you use Animal Crossing map editor.
You can swat them off. They are nocturnal, so you shouldn't see them, but they don't bury their heads like ticks.