Which of the following statement is not correct

Options

A. Noble gases have a different number of outermost electrons than their group number
B. In the sixth period the orbitals being filled are 6s, 4f, 5d, 6p
C. Zn, Cd, Hg are non transition elements
D. `O^(-2)` has the same no. of `e^(-)s` in its outermost as well as penultimate shell.

Answer

D