Question

uranium
drag the correct answer into the blank.
uranium is a naturally occurring element that is
. this term often conjures the thought of being very dangerous, even though it is found in our surroundings daily.
solid
radioactive
common

Explanation:

Uranium is a radioactive element. Radioactivity is a key property associated with uranium, which is why the term often makes people think of danger. While uranium can be in a solid state (it's a metal), the more defining and relevant property here related to the "dangerous" connotation is its radioactivity. "Common" doesn't fit as well because although it's found in the environment, the emphasis in the context of the sentence (with the danger aspect) is on its radioactive nature.

Answer:

Radioactive