Here's why:

* Mercury's boiling point is 356.73 °C (674.11 °F). This is relatively low for a metal.

* The question asks for a boiling point of 357 degrees, which is very close to mercury's actual boiling point.

It's important to note that there might be other substances with boiling points very close to 357 degrees, but mercury is the most common element with a boiling point in that range.