Infinitium is an imaginary element with the atomic number ∞ and symbol If. Hence its name, every property of infinitium would be infinite in value, including melting and boiling points, thermal and electrical conductivities. Infinitium would contain infinite number of protons, neutrons, and electrons, adding up to infinite mass. Though due to its tremendous weight and gravity, infinitium atom would be crushed to a point of zero size, known as singularity, therefore infinitium is a possible chief element that makes up black holes. Infinitium would be stable against radioactivity due to infinite density and gravity effective at holding all the component particles together.