moseley's law: meaning, definition, pronunciation and examples
C2Technical / Scientific
Quick answer
What does “moseley's law” mean?
A law in physics stating that the square root of the frequency of X-rays emitted by an element is proportional to the element's atomic number.
Audio
Pronunciation
Definition
Meaning and Definition
A law in physics stating that the square root of the frequency of X-rays emitted by an element is proportional to the element's atomic number.
An empirical law formulated by Henry Moseley (1913) which established a clear, linear relationship between an element's atomic number and the frequencies of its characteristic X-ray spectral lines, providing the first definitive experimental basis for ordering elements in the periodic table and predicting the existence of undiscovered elements.
Dialectal Variation
British vs American Usage
Differences
No significant differences in usage or spelling. Both regions use the possessive form 'Moseley's'.
Connotations
Strongly associated with foundational work in atomic physics and the history of the periodic table. Conveys precision and empirical rigour.
Frequency
Extremely low frequency in general discourse. Used almost exclusively in physics, chemistry, and history of science contexts.
Grammar
How to Use “moseley's law” in a Sentence
[Subject] obeys Moseley's law.Moseley's law states that [clause].Vocabulary
Collocations
Usage
Meaning in Context
Business
Virtually never used.
Academic
Used in physics, chemistry, and history of science lectures, textbooks, and research papers concerning atomic structure or the periodic table.
Everyday
Never used in everyday conversation.
Technical
Core term in X-ray spectroscopy and atomic physics for explaining the systematic ordering of elements and identifying unknown elements.
Vocabulary
Synonyms of “moseley's law”
Neutral
Weak
Watch out
Common Mistakes When Using “moseley's law”
- Misspelling as 'Mosley's law' (dropping the 'e').
- Incorrectly stating it relates to atomic *mass* instead of atomic *number*.
- Using lowercase ('moseley's law').
FAQ
Frequently Asked Questions
It was formulated by the English physicist Henry Moseley in 1913.
It resolved inconsistencies in the periodic table by showing that atomic number, not atomic weight, was the fundamental property determining an element's position.
Yes, it remains a valid empirical law within the framework of early quantum theory and is historically crucial, though it is now understood as a consequence of the quantum mechanical model of the atom.
It is primarily used in atomic physics, X-ray spectroscopy, and the history of chemistry and physics.
A law in physics stating that the square root of the frequency of X-rays emitted by an element is proportional to the element's atomic number.
Moseley's law is usually technical / scientific in register.
Moseley's law: in British English it is pronounced /ˈməʊzliːz lɔː/, and in American English it is pronounced /ˈmoʊzliːz lɑː/ or /lɔː/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: Moseley Moved the elements into their correct Order by linking Spectral lines to atomic number. (M-O-S).
Conceptual Metaphor
A MAP or a RULER for the elements; it provides a precise scale to measure and position elements based on a fundamental property.
Practice
Quiz
What is the primary significance of Moseley's Law?