2019 · Q117
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?
General KnowledgeChemistry
- ADmitri Mendeleev
- BHenry Moseley
- CJ.J. Thomson
- DErnest Rutherford Finished Solving the Paper ? Time to evaluate yourself ! SCANTHE CODE SSCCAANN For elaborated Solutions 175
Explanation
Henry Moseley's 1913 X-ray spectroscopy experiments established that the atomic number — the number of protons — is the fundamental property of an element, more fundamental than atomic mass, yielding the modern periodic law (‘properties are periodic functions of atomic number’). Mendeleev had arranged his table by atomic mass. Hence Moseley.