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1914. In 1914 Henry Moseley found a relationship between an element's X-ray wavelength and its atomic number (Z), and therefore resequenced the table by nuclear charge rather than atomic weight. Before this discovery, atomic numbers were just sequential numbers based on an element's atomic weight. Moseley's discovery showed that atomic numbers had an experimentally measurable basis.

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Related Questions

What was the name of the first scientist who grouped the elements an the periodic table?

MOSLEY


Who arranged the periodic table according to increasing atomic number?

Henry Mosley


What contribution did Mosley makers the development of the periodic table?

Henry Moseley showed elements in the periodic table should be in order by their atomic number instead of atomic mass.


What is the basis of Mosley's periodic table?

Moseley arranged the elements according to increasing atomic number.


How is mosley's basics for arranging the elements different from mendeleeve's?

Dmitri Mendeleev created and sorted the periodic table by atomic mass. When years later Mosley rearranged the table and sorted it by Atomic number.


When did Mendeleev's create the periodic table of elements?

The periodic table is from 1869.


What did Moseley contribute to the development of the periodic table?

Mosley arranged elements in order of increasing atomic number


Did dmitry mendeleev credited with developing the first periodic table?

Yes, Dmitry Mendeleev is credited with developing the first version of the periodic table in 1869. He organized the elements based on their atomic mass and properties, and left gaps for elements that had not yet been discovered.


Who orginized the periodic table of elements?

There have been two make ups of the periodic table so far Mosley made the first one but was overtaken by Dimitri Mendeleev's form, which we use today.


Who improved the table of elements?

Dimitri Ivanovich Mendeleev was the one who first created the periodic table of elements.After that, Henry Mosley modified it on the basis of atomic number,


What if the xkcd periodic table was used to create a new element?

If the xkcd periodic table was used to create a new element, it would likely be a fictional or humorous element, as the xkcd periodic table is not based on scientific accuracy.


What contributions did Moseley make to development of The modern periodic table?

Mosley arranged elements in order of increasing atomic number