Why there is striking similarities (horizontal and vertical ) among successive members of the transition series ?

Why enthalpy of atomisation Zn is the lowest in the first transition series ?

Why the properties of third transition series are very similar to second transition series ?

A projectile is thrown at an angle such that the horizontal and vertical velocities are 9.8m/s and 19.6m/s , it strikes at a point distance from point of throw as

(i) Write the balanced equations to represent what happens when (a) acidified potassium permanganates reacts with hydrogen sulphide ? (b) acidified potassium dichromate solution reacts with iron (II) solution (ionic equation) ? (ii) The figure given below illustrates the first ionisation enthalpies of first, second and third series of transition elements. (a) Which series amongst the first, second and third series of transition elements have the highest first ionisation enthalpy and Why ? (b) Why there is a fall in IE_(2) from Cr to Mn and from Cu to Zn ? Explain.

Among the following series of transition metal ions the one where all the metal ions have 3d^2 configuration is - (At No T_i = 22 , V=23 , Cr = 24 , Mn = 25 )