code: def from_row_and_group(row: int, group: int):
          
          for sym in _pt_data.keys():
              el = Element(sym)
              if el.row == row and el.group == group:
                  return el
          raise ValueError("No element with this row and group!")
docs: Returns an element from a row and group number.
  
          Args:
              row (int): Row number
              group (int): Group number
  
          .. note::
              The 18 group number system is used, i.e., Noble gases are group 18.