Rtl-zn
chem formula
Need to draw C13H10N4O4Zn.2(C3H7NO) thanks if you can can solve​

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.

a corroding iron, if that's one of your choices