Trends in periodic table

Down the group density of elements increases, this is a trend in the periodic table. In which of these pairs is this trend not true?

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

Trends In Periods

The trend common to both the group 2 and 16 elements in the periodic table is that with increases in atomic number

Discuss the factors affecting electron gain enthalpy and the trend in its variation in the periodic table.

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 ?