In an electrically neutral atom of any element, there are equal numbers of

its going to be mutualism cuz they both benefit from the relationship.

~batmans wife dun dun

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.

answer; 4 electrons;