The periodic table was arranged by atomic mass ... Mendeleev had seen that they needed to be swapped around, but it was Moseley that finally determined why. He fired the newly-developed X-ray gun at ...

Up until this point the atomic number simply referred to an element’s positioning in the periodic table, and was not known to correspond to a measurable physical quantity. Thanks to Moseley’s work it ...

Moseley discovered that element 61 was missing ... the highest atomic number in the periodic table. But element 61 was still not known to exist. During the Manhattan Project, workers in Oak ...

The periodic table that we follow for our studies is the ... This arrangement was established by the British physicist Henry Moseley in 1913, who discovered that the atomic number (the number ...

In addition, Moseley's laws allow us to calculate very accurately the wave-lengths of the X-ray spectral lines for any element in the periodic table, if those of the elements in its neighbourhood ...