This toxic and extremely volatile element is also the most dense metal in the periodic table, with a 22.59 g / cm³ density. It is a rare element that is extracted from platinum.

Osmium’s density is 22.6 grams per cubic centimeter. OP measured the inside dimensions of the small flat rate box and multiplied them to get the volume, 75.3 cubic inches. This is equal to 1,234 ...