Which of the following represents the greatest mass
(A)2.0 x 10 3 mg( B)10.0dg (c)0.0010kg

An ion is an element that bears only one electric charge, either positive or negative. An isotope is an element with the same number of protons but a different number of neutrons. An electron is a negatively charged subatomic particle. A dipole fits the characteristics. Hence, the answer is B.