In 1913, the well-known physicist Henry Moseley determined the energy emitted when low-level electrons alter their orbit using the structure of Bohr’s atomic model. Moseley’s law is nothing but an empirical law concerning the characteristics of X-rays emitted by atoms. Moseley’s law was discovered and published in 1913 by the famous physicist Henry Mosley. According to Moseley’s law, the frequency of the emitted X-ray is directly proportional to the square of the atomic number. It can be represented as follows:
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Important Questions with Answers
1. State and explain Moseley’s law.
According to Moseley’s law, the frequency of the emitted X-ray is directly proportional to the square of the atomic number. It can be represented as follows:
2. What is Moseley’s theory?
The famous scientist Moseley published his research in 1914. He concluded that in an atomic nucleus, the atomic number is the number of positive charges. Moseley also expressed that there were three strange elements with atomic numbers 43, 61, and 75, located between gold and aluminium.
3. What did Moseley’s experiment demonstrate?
Moseley’s research established that three elements were absent from the periodic table at the time, that is, atomic numbers 43, 61, and 75. Others soon observed, exposing additional gaps such as atomic numbers 72, 85, 87, and 91, raising the number of absent elements to seven.
4. What are the applications of Moseley law?
Applications of Moseley’s law are as follows:
Moseley’s law discovered new elements like Rhenium (75), Technetium (43), Hafnium (72), etc. To find these elements, he used the concept of the atomic number instead of atomic mass. He rearranged elements in the periodic table, which helped to solve many dissimilarities.
5. Who prepared modern periodic law?
Henry Moseley presented modern periodic law in 1913.
6. What was the essential contribution Moseley made?
Moseley’s contribution to the periodic table was to arrange the elements according to their atomic numbers. He discovered that the number of protons in an element determines its identity, and it represents the atomic number of an element.
7. What is the difference between Mendeleev’s periodic table and Moseley’s periodic table?
The fundamental difference between Mendeleev’s and Moseley’s periodic table arrangements is that Mendeleev organised elements ascendingly according to atomic masses, whereas Moseley placed them ascendingly as per atomic numbers.
8. What change was introduced by Moseley in Mendeleev’s periodic law?
Mendeleev’s periodic table was organised based on the increasing atomic masses of elements. Henry Moseley changed Mendeleev’s arrangements of the periodic table by altering the criteria by which elements were organised. Mosley changed this criterion and again arranged the periodic table in increasing order of atomic number.
9. What is K-alpha?
Whenever an electron vacancy in the K-shell gets filled by an electron emitted from the L-shell, the photon’s characteristic energy or wavelength is called K-alpha. It can be denoted as Kα.
10. What is K-beta?
Whenever an electron vacancy in the K-shell gets filled by an electron emitted from the M-shell, the photon’s characteristic energy or wavelength is called K-alpha. It can be denoted as Kβ.
Practice Questions
- What is the principal quantum number?
- What is the significance of Moseley’s law?
- How can Moseley’s law be explained on the basis of Bohr’s theory?
- What is the conclusion of Moseley’s experiment?
- What is Z in Moseley’s law?
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