[Answer] 5. The toxicity of this element is well known, but when I was a child we still played with it in science classes. What element, also known as quicksilver, is the only metallic element that is liquid at room temperature and pressure?

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...1. Alcohol 2. Bromine 3. Mercury 4. Water Mercury, whose chemical symbol Hg derives from its older name of hydrargum, meaning silver water, is highly toxic when in a water-soluble compound. The vapors of the actual metal are also toxic, but it was nevertheless widely used in a number of applications such as thermometers, barometers, electrical switches, and is apparently still used as part of the mixture used to fill dental cavities. And, of course, it's fun to watch the little balls of mercury roll around on a flat surface - have you seen the maze puzzles which involve tipping a sealed container to move the mercury through the maze? Harder than the ones with solid metal balls, because the mercury tends to fragment, and you have to go back to pick up the pieces. The red paint pigment vermilion is produced from cinnabar, one of the most common naturally-occurring mercury compounds.

Step 2 : Answer to the question "5. The toxicity of this element is well known, but when I was a child we still played with it in science classes. What element, also known as quicksilver, is the only metallic element that is liquid at room temperature and pressure?"

Mercury:

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