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what does (n-2) in electronic configuration of f block elements signify?

what does (n-2) in electronic configuration of f block  elements signify?
 

Grade:11

1 Answers

Arun
25750 Points
5 years ago
F block elements have their general electronic configuration as ns^2 (n-1)d^0–1 (n-2)f^1–14.This because at Z 57 after lanthanum some elements try to join d orbital instead of f by violating the aufbau principle to attain stability but very few like z=64,58&71 but even though all have same properties to that of lanthanum

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