Protons are positive
Neutrons are neutral
Electrons are negatively charged
The word elliptical refers to an Oval.
A rock is definitely more dense. If you were to put a cloud in water it would float/stay above it and a rock would sink to the bottom
We need the diagram to answer the question
$724.73 this would be the answer because if you subtract 320.50 and 86.10 from the 1056.33 then add 75 you get 724.73