TABLE I _Distribution of the Elements in Groups and Series_ +--------+-------+----------+----------+----------+----------+ | Group | I. | II. | III. | IV. | V. | +--------+-------+----------+----------+----------+----------+ |Series 1| H | -- | -- | -- | -- | | | | | | | | | " 2| Li | Be | B | C | N | | | | | | | | | " 3| Na | Mg | Al | Si | P | | | | | | | | | " 4| K | Ca | Sc | Ti | V | | | | | | | | | " 5| (Cu)| Zn | Ga | Ge | As | | | | | | | | | " 6| Rb | Sr | Y | Zr | Nb | | | | | | | | | " 7| (Ag)| Cd | In | Sn | Sb | | | | | | | | | " 8| Cs | Ba | La | Ce | Di? | | | | | | | | | " 9| -- | -- | -- | -- | -- | | | | | | | | | " 10| -- | -- | Yb | -- | Ta | | | | | | | | | " 11| (Au)| Hg | Tl | Pb | Bi | | | | | | | | | " 12| -- | -- | -- | Th | -- | | | | | | | | +--------+-------+----------+----------+----------+----------+ | |R_{2}O |R_{2}O_{2}|R_{2}O_{3}|R_{2}O_{4}|R_{2}O_{5}| | | | | | | | | | -- |RO | -- |RO_{2} | -- | | | | | | | | | | -- | -- | -- |RH_{4} |RH_{3} | | | | | | | | +--------+-------+----------+----------+----------+----------+