A copper atom has 29 electrons revolving around the nucleus. a copper ball contains 4x10²³ atoms. what fraction of electrons be removed to give the ball a charge of 9.6x10 ⁻⁶ c
a) -1.8 x 10⁻¹³
b) 6 x 10⁻¹⁰
c) -5.2 x 10⁻¹²
d) -1.3 x 10⁻¹²