3. Which is the most molecule that has the greatest number of atoms? a) H2SO4 b) 2002 c) CH3CH2COOH d) HNO3

HNO3 is the answer HNO3 is the answer

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.