Words that rhyme with -ium

Magnesium is a highly reactive metal that is not found in its pure form. It is quite common, and is essential for life. The pure metal burns bright white and is an ingredient in flares.

A trapezium is a shape with four sides. Two of the sides are the same length and the other two are different lengths. A trapezium looks like a rectangle that has been pinched in at the top. The building in the picture seen from this angle looks like a trapezium.