what charge should be placed on a coin of mass 5.7 g so that the electric force balances the weight of the coin near the earth's surface

d

explanation:

i think the answer is d. but im not sure!

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

god i hope this !