An atom that gains or loses an electron has a net electric charge and is called a/n
a. proton.
b. ion.
c. electron.
d. neutron. user: which sentence best describes mass movement?
a. the steady pace of air bouncing off a mountain
b. the downhill movement of animals due to heavy snow in their normal home
c. the movement of particles within an atom
d. the downhill flow of soil and rock resulting from gravity

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=