In 1869, Russian chemist Dimitri Mendeleev proposed arranging the known elements by atomic weights and properties in 17
columns with two partial periods of seven elements each followed by two nearly complete periods. Rayleigh and Ramsey
improved the periodic table by discovering the inert gases. In 1911, Henry Moseley subjected elements to x-rays and was able
to derive the relationship between x-ray frequency and number of protons. When Moseley arranged the elements according to
increasing atomic numbers and not atomic masses, some inconsistencies associated with Mendeleev's table were eliminated.
The modern periodic table is based on Moseley's Periodic Law.
Changes in the periodic table from 1800's to the present are based on all BUT ONE of these factors.
A)
peer review
B)
empirical data
C)
fact verification
D)
journal publication
Answers: 3
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In 1869, Russian chemist Dimitri Mendeleev proposed arranging the known elements by atomic weights a...
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