Atom bombardment ejects what appeared to be hydrogen nuclei. By 1920 he had accepted that the hydrogen nucleus is a distinct particle within the atom and named it proton. Neutrons have no electrical charge and have a free mass of 1,839 times the mass of the electron, or , the heaviest of the three constituent particles, but it can be reduced by the nuclear binding energy. Neutrons and protons (collectively known as nucleons) have comparable dimensions—on the order of —although the 'surface' of these particles is not sharply defined. The neutron was discovered in 1932 by the English physicist James Chadwick.
The ATOM Project artist and painter Karipbek Kuyukov (b. 1968) who was born without arms and experienced many nuclear tests as a child. He became a renowned artist painting with his mouth and feet and an internationally recognised anti-nuclear weapons activist. In May 2016, he opened his first exhibition in Astana. Kuyukov and Kazakhstan President Nursultan Nazarbayev were nominated in 2017 for the Nobel Peace Prize. The ATOM Project The ATOM Project (est. August 2012) is an international campaign by the Nazarbayev Center of Kazakhstan. The primary goal of the campaign is to build international support for the abolishment of nuclear testing. ATOM