The “lead” of a pencil is actually made of a substance called graphite which is made of carbon atoms. The picture shows a close-up of one carbon atom. A hydrogen atom has one proton as the nucleus and ...
In 1996 we were ready to synthesize element 112. We selected a beam and a target material so that the sum of their protons gave 112: a zinc beam consisting of 30 protons and 40 neutrons was used ...