Choose the correct relationship between the sign of Change in Hrxn and whether a reaction is exothermic or endothermic.

answer; i do believe the correct answer is (river); /// good luck

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.

i don,t know so just answer mine