We want to find how much charge is on the electrons in a nickel coin. follow this method. a nickel coin has a mass of about 5.7 g.
a. find the number of atoms in a nickel coin. each mole (6.02 × 10^23 atoms) has a mass of about 57.9 g. answer in units of atoms.
b. find the number of electrons in the coin. each nickel atom has 28 electrons/atom. answer in units of electrons.
c. find the magnitude of the charge of all these electrons. answer in units of c.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.