B. Neon, atomic number 10.
First calculate the volume of the rectangular prism by
multiplying its length, width and height. The volume of the prism is 8 cm^3.
Since density is known to be mass over volume, just multiply the given density
with the volume. The mass of the prism then is 960 grams.
The deeper you go under the sea, the greater the pressure of the water pushing down on you. For every 33 feet (10.06 meters) you go down, the pressure increases by one atmosphere this is all because of an increase in hydrostatic pressure
Particles move independently of one another and are widely spaced
Hope that helps :)