30 Questions
Who is credited with the idea of the periodic table?
Dimitri Ivanovich Mendeleev
What does the periodic law indicate?
That when the list of chemical elements is in an ascending order of atomic numbers, several properties undergo cyclical changes with similar properties recurring at various intervals.
When did Mendeleev's principle of the periodic table come into operation?
1871
What is the significance of Mendeleev's technique of classifying chemical elements?
It laid the foundation on which inorganic chemistry is built, brings order to experimental data, and predicts the incidence of some previously unknown elements.
How many elements were involved at the time Mendeleev came up with the principle of ascending atomic numbers?
63
How many elements are there in the current periodic table?
118
What did Mendeleev's principle of the periodic table bring order to?
The complex quantity of experimental data
Who is credited with the first attempt to define an element in the late 18th century?
Antoine-Laurent Lavoisier
Who linked elements to atoms and introduced the concept of atomic weight in 1808?
John Dalton
When was Mendeleev's periodic system designed?
Based on the association between atoms and individual elements.
What did Mendeleev's periodic system bring?
Predictability and allowed for the prediction of additional elements and modifications in atomic weights.
What was discovered around 1880 as per Mendeleev's technique?
Beryllium's correct atomic weight of 9.1
What were some of the elements accurately predicted by Mendeleev?
Scandium, gallium, and germanium
What led to controversies regarding the credibility of the periodic table?
Discovery of new elements and inconsistencies in atomic weights
Who was able to provide a comprehensive explanation after coming up with a theory based on the original concepts of the quantum theory?
Bohr
What were the symbols for the quantum numbers used to describe the orbits of electrons?
'n' and 'k'
In which years were the books with the symbols 'n' and 'k' published?
1921 to 1923
What did Bohr allocate to every element from hydrogen to uranium?
Configurations of electrons
What guided Bohr in allocating configurations of electrons to elements?
Elements' chemical properties, theory of correspondence, and X-ray spectroscopy's data
What did Bohr manage to recreate in his manner of allocating electron configurations to elements?
Entire periodic table or system
How many elements did Bohr suggest comprised the little-known group made up of the rare earth metals?
14
During which event did Bohr suggest the hypothetical element's electron configuration and assigned it an atomic number of 118?
1922 Nobel Prize lecture
What was the name of the element that was recognized as the one Bohr had predicted close to a hundred years ago?
oganesson
Who developed an atomic model in 1904 demonstrating the existence of electrons within an atom?
J.J. Thomson
What did Frederic Soddy propose, revolutionizing the existing chemical theory?
The concept of isotopes
Who gained prominence for the theory of the atomic nucleus and included the concept of atomic number?
Ernest Rutherford
What evidence did Henry Moseley's spectroscopic measurements of X-rays provide for?
The principle of atomic number
Who proposed configurations of electrons for light elements as per the atomic theory in 1913?
Bohr
What challenged existing knowledge about elements and their classification in 1896?
The discovery of radioactivity
What did Mendeleev believe about radioactivity and heavy elements like radium?
Mendeleev believed radioactivity was not an atomic property and heavy elements like radium could not transmute into other elements
Study Notes
Development of the Periodic Table and Revelations about Radioactivity
- Mendeleev and like-minded chemists believed the periodic table did not need to be clarified further according to atomic structure
- Chemists with contrasting ideas hypothesized that atoms were made up of microscopic and primordial particles
- Chemists like Crookes, Thomsen, and Meyer believed the periodic system could be described in atomic structure terms
- Physicist J.J. Thomson developed an atomic model in 1904 demonstrating the existence of electrons with negative charge within an atom
- Thomson's model provided an explanation for the relationship between atomic weight and properties as per the periodic law
- The basis of Thomson's endeavor to define the periodic table on the basis of electron configurations was an atomic model that stood the test of time for a decade
- The discovery of radioactivity in 1896 challenged existing knowledge about elements and their classification
- Mendeleev believed radioactivity was not an atomic property and heavy elements like radium could not transmute into other elements
- Frederic Soddy proposed the concept of isotopes, revolutionizing the existing chemical theory
- Ernest Rutherford's theory of the atomic nucleus gained prominence among physicists and included the concept of atomic number
- Henry Moseley's spectroscopic measurements of X-rays provided evidence for the principle of atomic number and contributed to the comprehension of Mendeleev's system
- In 1913, Bohr proposed configurations of electrons for light elements as per the atomic theory, corresponding to the periodic table
Explore the historical development of the periodic table and the impact of radioactivity on our understanding of atomic structure in this informative quiz. Test your knowledge on key figures, discoveries, and theories that have shaped the field of chemistry.
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