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____________ observed the X-rays’ characteristics.

(a) Henry Moseley

(b) Mendeleev

(c) Pauli

(d) Newland

The question was asked in an online quiz.

My doubt is from Modern Periodic Law and the Present Form of the Periodic Table in portion Classification of Elements and Periodicity in Properties of Chemistry – Class 11

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Right answer is (a) Henry Moseley

The best I can explain: Henry Moseley was an English physicist whose is know for modification of Mendeleev’s periodic table as he found out that atomic number is more prominent than atomic weight by his observation in regularities in characteristics in X-rays.

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