The 3d-series elements ranges

Which of the 3d series elements is not considered as transition element?

How heat of atomisation changes in 3d-series elements are stable?

Why 3d-series of elements acts as good catalyst?

How many elements are there in 3d-series elements ?

Why 3 d - series of elements acts as good catalyst?

(A) Metals of 4d and 5d series have greater enthalpies of atomization than the corres- ponding 3d series. (R) 4d and 5d series elements are smaller than 3d series

Assertion : The order of atomic radii of Cu, Ag and Au is Cu lt Ag ~~ Au . Reason : The atomic radii of 4d series elements are larger than those of 3d series elements but generally the radii of 4d and 5d series elements are almost identical.

Assertion : The order of atomic radii of Cu, Ag and Au is Cu lt Ag ~~ Au . Reason : The atomic radii of 4d series elements are larger than those of 3d series elements but generally the radii of 4d and 5d series elements are almost identical.