How many hg/dam" in 3.5 g/cm3?

Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

What is the polyatamic ion of thiosulfate