OCR Text |
Show Electreas la Atom Physicists of today state that there Is evidence that all atoms known have In them a certain definite number of negative electrons and exactly the tame number of positive electrons. For Instance, the lead atom consists of a positive nucleus charge of 82 nults about which 82 electrons revolve; re-volve; zinc, a nucleus charge of 80 nnlts with 30 revolving electrons; helium, nucleus chsrge of 2 units with 2 revolving electrons ; sulphur, a nucleus charge of 18 units with 10 revolving re-volving electrons; platinum, 78; gold, 79; radium, 88, etc. |