Atomic radius
 In this series there is a decrease in atomic radius radius of two little legs pain due to small increase of nuclear charges are protons.

 Ionization potential
Amount of heat energy required to remove outermost unpaired electron and gaseous atom and isolated atom size of a term in the series increases due to decrease in size A period wise due to increase in number of protons are effective nuclear charge.

Variable Oxidation State
In first series of Transition Element there is a variable Oxidation state the variable Oxidation state is due to minor difference of energy in between 4S and 3D

 Colour
 According to CFT all compounds are ions of Transmission metals are coloured it can be explained as follows the substance possess V D orbitals in ground state and orbitals are equal energy be generated orbital when a strong electric or magnetic field is placed near to this field splitting they are splitted are divided into two groups of orbitals are called Tripoli generated orbitals and are called equally generated the difference of energy in between these groups is equal to energy of visible light region therefore an electron jumps out from TTY to each orbital it absorb all regions of visible light and during jump is orbital it keeps some regions of visible light and rays of light is emitted and this produces as colours to viewers