Which of the following statements are true of uranium-238? i. its chemical properties will be exactly like those of uranium-235. ii. its mass will be slightly different from that of an atom of uranium-235. iii. it will contain a different number of protons than an atom of uranium-235. iv. it is more plentiful in nature than uranium-235. a. iii, iv b. i, ii, iii c. i, ii, iv d. ii, iii, iv e. all of these