periodic properties and its trends

Which one of the following is not a periodic property i.e. does not show any trend on moving from one side to the other in the periodic table ?

Trends in periodic properties of d-block elements: 1- atomic size | 2- Ionosation energy ( only trend)

Elements in Periodic Table show periodicity of properties''. List any four properties.

In general ,the property (magnitudes only)that shows an opposite trend In comparision to other properties across a period is :