Use the graph to complete the sentences.
The large bump in the middle represents the
than the energy
The energy of the products is
of the reactants.
This is an
reaction.

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.

the awnser is group 12