Write the group number and period number of 4F and 5F series elements
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the group number of 4F series elements : 3
the group number of 5F series elements : 3
the period number of 4F series elements : 6
the period number of 5F series elements :7
the group number of 5F series elements : 3
the period number of 4F series elements : 6
the period number of 5F series elements :7
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The 4F and 5F series belong to the same group, IIIB whereas the period numbers of 4F and 5F are 6 and 7 respectively.
- 4F series elements are also called Lanthanides, named after the first element Lanthanum.
- In the Lanthanide series, the first element is Lanthanum, and the last element is Lutetium. 4f orbitals are filled in this series.
- 5F series elements are also called Actinides, named after the first element Actinium.
- In the Actinide series, the first element is actinium, and the last element is Lawrencium. 5f orbitals are filled in this series.
- Both 4F and 5F series belong to the same group, IIIB due to their similar outer shell configuration containing 3 valence electrons.
- The outermost shell in Lanthanides is 6, so they belong to the sixth period whereas the actinides with the outermost shell, 7, belong to the seventh period.
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