Final answer:
The term '7 subdivided PI identifiers' refers to elements with atomic numbers 87-118 on the periodic table, starting from Francium (Fr) to Oganesson (Og), which have electronic configurations commencing with the 7th shell.
Step-by-step explanation:
The 7 subdivided PI (Principal Investigator) identifiers likely refer to specific elements in the periodic table, particularly those with atomic numbers 87 to 118. These elements belong to the actinide series (starting from actinium) and the transactinide series (elements beyond actinium).
The electronic configurations for these elements typically begin with the electron shell number 7, hence the mention of 7s¹ (for Francium), 7s² (for Radium), and continue with various configurations that include the 6d and 5f orbitals for the subsequent elements.
Here are the symbols for the elements in question and their typical electron configurations:
- 87 Fr - Francium: 7s¹
- 88 Ra - Radium: 7s²
- 89 Ac - Actinium: 7s² 6d¹
- Elements 104-118 - Rf, Db, Sg, Bh, Hs, Mt, Ds, Rg, Cn, Nh, Fl, Mc, Lv, Ts, Og with configurations starting from 7s² 5f± 6d² and so forth, based on each element's position in the periodic table.
These elements are all radioactive and many are synthetic, meaning they are not found naturally and must be created in laboratory settings.