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How did bohr's new model account for the periodic repetition of properties of the elements?
Bohr's model, based on quantized energy levels for electrons in an atom, explained the periodic repetition of elemental properties through the arrangement of electrons in these energy levels or shells. As elements are organized in the Periodic Table, their chemical behavior is influenced by the number and configuration of their outermost electrons. This arrangement leads to similar chemical properties within groups of elements, as those in the same group have the same number of valence electrons, resulting in comparable reactivity and bonding characteristics. Thus, Bohr's model provided a framework for understanding the trends observed in the periodic table.
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Who left spaces in the periodic table and why?
Dmitri Mendeleev left gaps in the periodic table to account for elements that had not been discovered yet. He predicted the properties of these missing elements based on the patterns he observed among known elements. This led to the successful discovery of new elements that filled in the empty spaces, validating his periodic table.
Why is the table of elements known as the periodic table?
It is called the periodic table because the elements are arranged in order of increasing atomic number, showing periodic trends in their physical and chemical properties. These patterns repeat at regular intervals, or periods, across the table.
Why did Dmitri leave blank spaces on the periodic table?
Dmitri Mendeleev left blank spaces on the periodic table to account for elements that had not been discovered yet. He predicted the existence and properties of these missing elements based on the patterns and trends of the known elements in the table. This allowed for the successful prediction of the characteristics of elements like gallium and germanium.
Which group of elements in modern periodic table were missing from newlands periodic table?
In Newlands' periodic table, the group of noble gases was missing. This is because noble gases, such as helium, neon, argon, krypton, xenon, and radon, were not discovered until after Newlands proposed his arrangement in the 1860s. As a result, he was unable to account for their unique properties and their placement in the periodic table.
What is the limitation of dobereiners periodic table?
All the elements known at that time could not be arranged as Dobereiner's triad's example: the three elements, nitrogen, phosphorus and arsenic have similar properties. Therefore they can be regarded to form a triad. However, the actual atomic mass if the middle element, phosphorus(P)(31.0u)is much lower than the average or mean(44.45u)of the atomic masses of nitrogen and arsenic. Thus, these three elements do not constitute a Dobereiner triad in spite of their similar chemical properties.
What problem in periodic table of Lothar Meyer?
Lothar Meyer's periodic table did not account for all known elements and did not correctly predict the properties of undiscovered elements. Additionally, it did not account for the concept of atomic number, which led to inconsistencies in the ordering of elements. Meyer's table also lacked a clear underlying periodic trend.
Who left spaces in the periodic table and why?
Dmitri Mendeleev left gaps in the periodic table to account for elements that had not been discovered yet. He predicted the properties of these missing elements based on the patterns he observed among known elements. This led to the successful discovery of new elements that filled in the empty spaces, validating his periodic table.
Why is the table of elements known as the periodic table?
It is called the periodic table because the elements are arranged in order of increasing atomic number, showing periodic trends in their physical and chemical properties. These patterns repeat at regular intervals, or periods, across the table.
Why did Medellev leave gaps in the periodic table?
Medellev left gaps in the periodic table to account for elements that had not yet been discovered. He predicted the properties of these missing elements based on the known trends and patterns in the table. This foresight and organization laid the groundwork for the future discovery of elements that filled those gaps.
What was the problem with the first periodic table?
The first periodic table by Dmitri Mendeleev did not account for the discovery of isotopes (elements with the same number of protons but different number of neutrons) and did not leave spaces for later-discovered elements. Additionally, it did not show the relationship between atomic number and chemical properties.
What are the elements in the periodic table based on?
Atomic Number
Why did scientists try to improve Mendeleevs table?
Scientists tried to improve Mendeleev's periodic table to account for the discovery of new elements, better organize elements based on their properties, and to address inconsistencies in the original table. This led to the development of the modern periodic table with elements arranged in increasing atomic number and grouped based on similarities in chemical properties.
Why did mendeleev leave blank spaces on his periodic table?
Mendeleev left blank spaces because certain elements on the Periodic Table were not known at that time. He knew that in the future, those elements would be found and placed on the periodic table.
Why did Dmitri leave blank spaces on the periodic table?
Dmitri Mendeleev left blank spaces on the periodic table to account for elements that had not been discovered yet. He predicted the existence and properties of these missing elements based on the patterns and trends of the known elements in the table. This allowed for the successful prediction of the characteristics of elements like gallium and germanium.
What were the limitations of Dobereiners classification?
Dobereiner's classification, which grouped elements into triads based on similar properties, had several limitations. It only encompassed a small number of elements, primarily focusing on the known elements at the time, which were insufficient to represent the entire periodic table. Additionally, not all elements could be neatly categorized into triads, and it failed to account for the periodicity of properties across larger groups of elements. This classification system was ultimately superseded by more comprehensive frameworks, like Mendeleev's periodic table.
Which group of elements in modern periodic table were missing from newlands periodic table?
In Newlands' periodic table, the group of noble gases was missing. This is because noble gases, such as helium, neon, argon, krypton, xenon, and radon, were not discovered until after Newlands proposed his arrangement in the 1860s. As a result, he was unable to account for their unique properties and their placement in the periodic table.
What was the problem with Dobereiner's periodic table?
Dobereiner's periodic table, proposed in the early 19th century, attempted to group elements into triads based on their similar chemical properties. However, this classification system was limited as it only included a few elements and did not account for all known elements at the time. Additionally, the triads were based on average atomic masses, which were not always accurate due to the existence of isotopes. This led to inconsistencies and inaccuracies in the arrangement of elements.
