If one penny weighs 3.16 g, what would be the dollar value of 1 metric ton of pennies? (knowing that 1 metric ton = 1000 kg)

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.

it means there are 3 atoms of oxygen