PeriodicTable
Forge
— Alternative Arrangements
A tool by
Leon Dudhill
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Mendeleev 1869
Short Form (8-group)
Long Form (32-column)
Left-Step (Janet)
Old IUPAC Groups (IA–VIII)
CAS Group Numbering
H above Li (Group 1)
H above F (Group 17)
He in Group 2 (Janet)
Spiral Concept
1869
Mendeleev's Original Table
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