Assertion: series's period | /r/HasProperty | 7 of the table
Facets:
Source sentences:
text: Ten other groups—3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 (previously numbered IIIb, IVb, Vb, VIb, VIIb, VIII, Ib, and IIb, with group VIII comprising groups 8, 9, and 10)—found only in Periods 4 to 7 of the table, are composed of elements of the transition series.