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An Intiative by Sri Chaitanya
a
Henry Moseley observed regularities in the characteristics X-ray spectra of elements
b
A plot of requency of X-rays emitted against atomic number (Z) give a straight line
c
The atomic number of element is equal to the number of neutron(s) in a neutral atom
d
Electronic configuration of an atom determine the physical and chemical properties
answer is C.
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