│ „ │ „ │ „ │ Rhodium │ │ │ │ │ 102·9 │ │ „ │ „ │ „ │Palladium │ │ │ │ │ 106·7 │ ├─────────┼─────────────────────┼───────────────────┼─────────────────┤ │ 7 │ Tellurium │ _Iodine_ │ XENON │ │ │ 127·5 │ 126·92 │ 130·2 │ ├─────────┼─────────────────────┼───────────────────┼─────────────────┤ │ │ │ │ │ │ 8 │ Tungsten │ —— 188 │ Osmium │ │ │ 184·0 │ │ 190·9 │ │ │ │ │ │ │ „ │ „ │ „ │ Iridium │ │ │ │ │ 193·1 │ │ „ │ „ │ „ │Platinum │ │ │ │ │ 195·2 │ ├─────────┼─────────────────────┼───────────────────┼─────────────────┤ │ 9 │ —— │ —— │ NITON │ │ │ │ │ 222·4 │ ├─────────┼─────────────────────┼───────────────────┼─────────────────┤ │ 10 │ Uranium │ │ │ │ │ 238·5 │ │ │ └─────────┴─────────────────────┴───────────────────┴─────────────────┘ ┌────────────────────────────────────────────────────────────────┐ │ * Lanthanum, Cerium, Praseodymium, Neodymium, ——, │ │Rare·Earth 139·0 140·25 140·6 144·3 │ │ Metals: │ │ „ Gadolinium, Terbium, Dysprosium, Holmium, Erbium,│ │ 157·3 159·2 162·5 163·5 167·7 │ └────────────────────────────────────────────────────────────────┘ ┌─────────────────────────────────────────┐ │ * Samarium, Europeum, ——, │ │Rare·Earth 150·4 152·0 │ │ Metals: │ │ „ Thulium, Ytterbium, Lutecium,│ │ 168·5 172·0 174·0 │ └─────────────────────────────────────────┘ NOTE.—Distinctions in printing: GASEOUS ELEMENTS. _Other non-metallic elements_, metallic elements. The heavy line encloses approximately the acid-forming elements. In this table the elements arranged in the order of their atomic weights fall into eight groups where the known oxides progress regularly, with the exception of two or three elements, from R_{2}O in Group I to R_{2}O_{7} in Group VII, while in Group VIII two oxides (of ruthenium and osmium) are known which carry the progression to RO_{4}.
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