Help pls :( :( :( :( :( :(

oof idk but plz do this go to yt and sub to solid fin! make sure ur subing thhe right one he mkes fortine vids and has in the 70-85 subs

Explanation:

thats all ty for 5 points lol

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 : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.