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.
Atom Bank Atom Bank Atom Bank is a digital financial company and challenger bank. It provides banking services through a smartphone app. It has no physical outposts. As a smartphone app-based bank, it does not have a traditional online banking outlet, as users must use the application to bank. Atom first secured its banking license in June 2015. The company publicly launched in April 2016. In March 2017 it raised £83 million in venture funding, which brought its total funding to over £200 million. On 9 March 2017, the bank experienced over 5,000 new customer signups in one day, a new record.