Assertion: Henry Moseley observed regularities in the characteristic 
‐ ray spectra of element. A plot of 
( 
against atomic number ( Z ) gave a straight line.
Reason: Henry Moseley showed thar the atomic number is a more fundamental property of an element than its atomic mass.
are true and 
is the correct explanation of A.
are true but 
is not the correct explanation of A.
is false
are false.
Text Solution
Verified by ExpertsA
Henry Moseley observed regularities in the characteristic 
‐ ray spectra of the elements. A plot of 
(where 1 ) is frequency of 
‐ rays emitted) against atomic number ( Z ) gave a straight line and not the plot of 
vs atomic mass. He thereby showed that the atomic number is a more fundamental property of an element than its atomic mass.
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