0Zr
0Zr is a hypothetical element with an atomic number of 0 and the symbol Zr. While the concept of an element with an atomic number of zero is purely theoretical, it is sometimes discussed in speculative contexts within nuclear physics and theoretical chemistry. In the standard model of particle physics, atomic nuclei are composed of protons and neutrons. The number of protons, the atomic number, defines an element. A zero atomic number would imply the absence of protons in the nucleus.
Currently, no known element possesses an atomic number of 0. All known elements have at least one