div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Neutron and Negative Proton src=https:reader030vdocumentssitereader030viewer2022020223575067ed1a28ab0f07adc8adhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1946 Nature Publishing Grouppdiv