Editing Atomic number (section)

=== Missing elements ===
After Moseley's death in 1915, the atomic numbers of all known elements from hydrogen to uranium (''Z''&nbsp;=&nbsp;92) were examined by his method. There were seven elements (with ''Z''&nbsp;<&nbsp;92) which were not found and therefore identified as still undiscovered, corresponding to atomic numbers 43, 61, 72, 75, 85, 87 and 91.<ref>[[Eric Scerri]], ''A tale of seven elements,'' (Oxford University Press 2013) {{ISBN|978-0-19-539131-2}}, p.47</ref> From 1918 to 1947, all seven of these missing elements were discovered.<ref>Scerri chaps. 3–9 (one chapter per element)</ref> By this time, the first four [[transuranium element]]s had also been discovered, so that the periodic table was complete with no gaps as far as [[curium]] (''Z''&nbsp;=&nbsp;96).