code: def from_Z(z: int):
          
          for sym, data in _pt_data.items():
              if data["Atomic no"] == z:
                  return Element(sym)
          raise ValueError("No element with this atomic number %s" % z)
docs: Get an element from an atomic number.
  
          Args:
              z (int): Atomic number
  
          Returns:
              Element with atomic number z.