What did Moseley use to reorder the elements of Mendeleev periodic table?

What did Moseley use to reorder the elements of Mendeleev periodic table?
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Henry Moseley discovered a relation between X-ray spectra and the atomic number of chemical elements.
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This scientist gave the law- ‘Properties of elements are a periodic function of their atomic number.’ This property of the fundamental importance of atomic number was discovered by- (1) Johann Wolfgang Döbereiner (2) John Newlands (3) Dmitri lvanovich Mendeléev (4) Henry Moseley

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In which group of elements of the modern periodic table are halogen placed ?

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