An unknown substance has a density of 45cm3 and takes up a volume of 3.2 cm3 what is the unknown substance

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants