The Inventor of the Atomic Number Organization of the Periodic Table
Henry Moseley 1887-1915
Henry Moseley was famous for sorting the periodic table of elements correctly after studying at the University of Manchester in 1913.
Henry Moseley fired beams of electrons at different kinds of metals and examined the spectrum of the X-rays produced. He eventually found that the frequency levels of the X-rays obeyed one simple rule. The X-rays produced by each of every element depended on its position in the elements listed from hydrogen at 1 and uranium at 92. Moseley classified the place of an element in the list its atomic number. He finally concluded that it was the atomic number of the element, not the atomic weight, that officially decided what the element was. Only whole atomic numbers fit the pattern; there were no elements without whole numbers. Moseley said that the atomic number has to be the number of positive charges on the nucleus.
Moseley would've been awarded a Nobel Prize and considered a famous scientist, but he died during World War 1 as a soldier in Turkey. He came from a very rich family, where he excelled at mathematics. His physicist originally introduced him to x-rays because he saw Moseley's potential as a scientist. Moseley's discovery is known as the Moseley's law.