A quick glance across the periodic table of elements yields some pretty obscure-sounding elements that may seem to be outside of everyday experience. We’ve never come across a lump of francium before, and elements such as cerium and technetium sound equally exotic. In fact, the universe itself is mostly comprised of the first two elements of hydrogen and helium, and on a rocky world like Earth, silicon and oxygen are the most prevalent. But did you know that some much more exotic elements may exist in your home or neighborhood? Surprisingly, these products of modern living may even be synthetic elements, and may be radioactive. Here are the top 10 elements you didn’t know were in your home.