A student walks 1.0 km due south. Then she runs 2.o km due west. Find the magnitude of the student's resultant displacement .

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.

k2s for potassium sulphide