Compare how a positively charged object and a negatively charged object will react when each is placed separately near an uncharged object.

They will be attracted with the uncharged object. ... The negative attracts positive ions of the uncharged object and the positive does the opposite one.

Explanation:

sorry if it didnt help. im  in seventh drade so im not so sure what u want hope it helped.          

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.

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