Modern Periodic Law
Modern periodic law was given by:
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About This Question
- Subject
- chemistry
- Chapter
- classification of elements and periodicity in properties
- Topic
- modern periodic law
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Moseley
Henry Moseley discovered that the X-ray spectra of elements show a linear relationship between frequency and atomic number.
- He concluded that the Atomic Number (Z) (the number of protons) is the fundamental property of an element, not atomic mass.
- Modern Periodic Law: "The physical and chemical properties of the elements are periodic functions of their atomic numbers."
- Mendeleev used atomic mass, Newlands used Octaves, and Dobereiner used Triads.
This easy difficulty chemistry question is from the chapter classification of elements and periodicity in properties, covering the topic of modern periodic law. It appeared in the 2025 exam.
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