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.

def from_row_and_group(row: int, group: int):
        """
        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.
        """
        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!")