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Template:Periodic table (Reihen and periods)

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Development of Reihen/periods and Gruppen/groups in the Periodic table 1871–modern
modern (long): IUPAC group 1 2 no number 3 4 5 6 7 8 9 10 × 11 12 13 14 15 16 17 18
1900+ (long): old IUPAC (A–B, Europe) IA IIA IIIA IVA VA VIA VIIA VIIIB IB IIB IIIB IVB VB VIB VIIB 0
CAS  (A–B–A, US) IA IIA IIIB IVB VB VIB VIIB VIIIB IB IIB IIIA IVA VA VIA VIIA VIIIA
1871 (short)→ Gruppe IA IIA [ ] IIIB IVB VB VIB VIIB VIIIB
IB
IIB
IIIB
IVB
VB
VIB
VIIB 		0
Period ① Reihe 1 H He
Period ② Reihe 2 Li Be B C N O F Ne
Period ③ Reihe 3 Na Mg Al Si P S Cl Ar
Period ④ Reihe 4 K Ca –Sc Ti V Cr Mn Fe Co Ni Cu(1st)
Reihe 5 (Cu)(2nd) Zn – Ga – Ge As Se Br Kr
Period ⑤ Reihe 6 Rb Sr Yt[=Y] Zr Nb Mo –([Tc]) Ru Rh Pd Ag(1st)
Reihe 7 (Ag)(2nd) Cd In Sn Sb Te J[=I] Xe
Period ⑥ Reihe 8 Cs Ba [La–Lu] ?Di[La] ?Ce[Ce] — — — — — — —(1st)
Reihe 9 (—)(2nd) — — — — — —
Period ⑥ Reihe 10 — — ?Er Yb ([Lu]) ?La – ([Hf]) Ta W –([Re]) Os Ir Pt Au(1st)
Reihe 11 (Au)(2nd) Hg Tl Pb Bi —[Po] —[At] [Rn]
Period ⑦ Reihe 12 —[Fr] —Rd[=Ra] [Ac–Lr] —[Ac] Th —[Pa] U — — — — —
Bold text in Periodic Table 1871
Italic text in Periodic Table 1906 (the last by Mendeleev)
Regular text (not bold) added after 1906
      begin–end of 1871 Reihe
– Ga Element predicted, later proven correct within Mendeleev's lifetime and added by him
– (Tc) Element predicted, later proven correct posthumously
– Element projected, but not predicted
strikethrough Element predicted, later proven wrong due to
– not an element ("?Di"), or
–wrong position ("[Ac]") because of non-recognition of separate rare earth series
[ ] Added or changed after 1871
Cu(1st) × / (Cu)(2nd) Element mentioned twice: in Gruppe VIII and I. The 2nd mentioning survived, Gruppe/group VIII was reduced from four columns to three (×)
Published 1871, English version: "Reihen" translated as "Series" (that is, arrays with regularity not just rows). Reproduced in Scerri (2007), p. 111
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