Chemistry · Classification of Elements and Periodicity in Properties

What is the general outer electronic configuration of the f-block elements (inner-transition elements)?

1. A
   \( (n-2)f^{0-14} (n-1)d^{1-10} ns^2 \)
2. B
   \( (n-2)f^{1-14} (n-1)d^{0-1} ns^2 \)
3. C
   \( (n-1)f^{1-14} nd^{0-1} (n+1)s^2 \)
4. D
   \( nf^{1-14} (n-1)d^{0-2} ns^2 \)