Nan exothermic reaction, what is true of the enthalpy? a. it has increased. b. it has decreased. c. it has remained unchanged. d. it has, at minimum, doubled.

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.

2b2t

explanation:

2b2t