Consider the following state- ment: -Atomic number of an element is a more fundamental property than its atomic mass." Who among the following scientists has made the above statement?

The statement that the atomic number of an element is a more fundamental property than its atomic mass was made by Henry Moseley in 1913. Before his discovery, the periodic table, most notably the version established by Dmitri Mendeleev, was arranged primarily by atomic weight [1]. Moseley used X-ray spectroscopy to demonstrate that the frequencies of X-rays emitted by elements are proportional to the squares of whole numbers, which he identified as the atomic number. This research proved that the atomic number represents the number of positive charges (protons) in the nucleus and is the most basic characteristic of an element. His work provided the scientific justification for reordering the periodic table based on atomic number rather than atomic weight, resolving previous inconsistencies in Mendeleev's arrangement [1].

Sources

1. [1] https://www.nist.gov/blogs/taking-measure/henry-moseley-patriotic-scientist-who-changed-periodic-table-and-then-went-war