Is a forest area that has been washed away by food a primary or secondary area of succession? predict how long it would take to reestablish itself and describe how it migth look at eaxh stage

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.

56 moles of   lieter in chemistry

so whats the answer tell me