james clerk maxwell is credited with developing the periodic table.
james clerk maxwell is credited with developing the periodic table.
who is credited with developing the periodic table?
james clerk maxwell
before moseley's discovery, the atomic numbers (or elemental number) of an element had been thought of as a semi-arbitrary sequential number, based on the sequence of atomic masses, but modified somewhat where chemists found this modification to be desirable, such as by the russian chemist, dmitri ivanovich mendeleev. in his invention of the periodic table of the elements, mendeleev had interchanged the orders of a few pairs of elements in order to put them in more appropriate places in this table of the elements. for example, the metals cobalt and nickel had been assigned the atomic numbers 27 and 28, respectively, based on their known chemical and physical properties, even though they have nearly the same atomic masses. in fact, the atomic mass of cobalt is slightly larger than that of nickel, which would have placed them in backwards order if they had been placed in the periodic table blindly according to atomic mass. moseley's experiments in x-ray spectroscopy showed directly from their physics that cobalt and nickel have the different atomic numbers, 27 and 28, and that they are placed in the periodic table correctly by moseley's objective measurements of their atomic numbers. hence, moseley's discovery demonstrated that the atomic numbers of elements are not just rather arbitrary numbers based on chemistry and the intuition of chemists, but rather, they have a firm experimental basis from the physics of their x-ray spectra.
henry moseley
list of periodic table-related articles









































section::::list of articles related to periodic table.









































bullet::::- periodic table









































bullet::::- extended periodic table









































bullet::::- extended periodic table (large version)









































bullet::::- alternative periodic tables









































bullet::::- periodic table (electron configurations)









































bullet::::- periodic table (metals and non-metals)









































bullet::::- periodic table (crystal structure)









































bullet::::- periods









































bullet::::- period 1, period 2, period 3, period 4, period 5, period 6, period 7, period 8









































bullet::::- blocks









































bullet::::- s-block, p-block, d-block, f-block, g-block









































bullet::::- groups
list of periodic table-related articles