{"id":86035,"date":"2025-06-01T03:35:12","date_gmt":"2025-06-01T03:35:12","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=86035"},"modified":"2025-06-01T03:35:12","modified_gmt":"2025-06-01T03:35:12","slug":"consider-the-following-statement-atomic-number-of-an-element-is-a-mo","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statement-atomic-number-of-an-element-is-a-mo\/","title":{"rendered":"Consider the following statement: “Atomic number of an element is a mo"},"content":{"rendered":"

Consider the following statement: “Atomic number of an element is a more fundamental property than its atomic mass.” Who among the following scientists has made the above statement?<\/p>\n

[amp_mcq option1=”Dmitri Mendeleev” option2=”Henry Moseley” option3=”J.J. Thomson” option4=”Ernest Rutherford” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-2 – 2019<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe statement “Atomic number of an element is a more fundamental property than its atomic mass” is a cornerstone of the modern periodic law. This concept was established by Henry Moseley through his experiments on X-ray spectra of elements.
\n<\/section>\n
\nDmitri Mendeleev developed the periodic table based on atomic mass, but he noted that some elements needed to be placed out of order by mass to fit their chemical properties into the correct groups. Henry Moseley’s work provided the physical basis for this ordering, showing that the frequency of characteristic X-rays emitted by an element is related to its atomic number (the number of protons in the nucleus), which is a more fundamental property determining chemical behaviour than atomic mass.
\n<\/section>\n
\nJ.J. Thomson is known for discovering the electron, and Ernest Rutherford is famous for the gold foil experiment which led to the discovery of the atomic nucleus. While both made crucial contributions to atomic structure, it was Moseley who linked atomic number to the properties that govern the periodic table arrangement.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Consider the following statement: “Atomic number of an element is a more fundamental property than its atomic mass.” Who among the following scientists has made the above statement? [amp_mcq option1=”Dmitri Mendeleev” option2=”Henry Moseley” option3=”J.J. Thomson” option4=”Ernest Rutherford” correct=”option2″] This question was previously asked in UPSC CDS-2 – 2019 Download PDFAttempt Online The statement “Atomic number … <\/p>\n

Detailed SolutionConsider the following statement: “Atomic number of an element is a mo<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1088],"tags":[1119,1162,1096],"class_list":["post-86035","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-2","tag-1119","tag-atomic-structure","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nConsider the following statement: "Atomic number of an element is a mo<\/title>\n<meta name=\"description\" content=\"The statement "Atomic number of an element is a more fundamental property than its atomic mass" is a cornerstone of the modern periodic law. This concept was established by Henry Moseley through his experiments on X-ray spectra of elements. 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