The wrong statement regarding transition metals among the following is:
A. 4s electron penetrates towards the nucleus more than 3d electron
B. Atomic radii of transitions metals increase in atomic number because of poor shielding of nuclear attraction by `(n-1)d` electrons
C. second and third transition series elements have nearly the same size
D. their densities are higher and densities of the 5d series elementrs are higher than those of 4d series elements
