Henry Moseley used the atomic number of elements to arrange them in his periodic table.
Henry Moseley used the atomic number (the number of protons in an atom's nucleus) to arrange the elements in his periodic table.
Henry Moseley used the atomic number to arrange the elements in his periodic table. The atomic number of an element is determined by the number of protons in its nucleus. Moseley's key insight was that the atomic number was a more fundamental property of an element than its atomic mass. Previously, elements had been arranged based on their atomic mass, but Moseley's work demonstrated that the periodic table makes more sense when elements are arranged by their atomic number instead. To determine the atomic number of an element, you can reference the periodic table or look up the element in a reliable source of information such as a chemistry textbook or reputable website.
