... feedback on the design of the Student Edition We thank these students for their hard work and creative suggestions in making the 2005 edition of Glencoe Science student friendly T Jack Andrews ... charge The other, called the cathode, has a negative charge In the tube that Crookes used, the metal cathode was a disk at one end of the tube In the center of the tube was an object shaped like ... to the rest of the atom For example, if the nucleus were the size of a table-tennis ball, the atom would have a diameter of more than 2.4 km Another way to compare the size of a nucleus with the...