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Gaps were left in Mendeleev’s Periodic Table to allow for the discovery of new elements in the future. Which of the following elements did not find a place in the Periodic Table until much later in history?
  • a)
    Silicon
  • b)
    Oxygen
  • c)
    Fluorine
  • d)
    Germanium
Correct answer is option 'D'. Can you explain this answer?
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Gaps were left in Mendeleev’s Periodic Table to allow for the di...
Mendeleev himself added these elements to the periodic chart in 1902 as group 0 elements, without altering the fundamental principle of the periodic table in the process. Alfred Werner, a Swiss chemist, was the first to solve the dead zone of Mendeleev’s table, which was discovered in 1905. He came to the conclusion that the rare-earth elements (lanthanides), of which there were 13 known, were contained within that gap.
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Gaps were left in Mendeleev’s Periodic Table to allow for the di...
Dmitri Mendeleev, the Russian chemist who is credited with creating the periodic table, did leave some gaps in his initial version of the table. These gaps were intentional and were based on his predictions of undiscovered elements that would fit into those positions.

Mendeleev organized the known elements based on their atomic weights and chemical properties, and he noticed that certain groups of elements had similar properties. He realized that there were spaces in his table where elements should exist but had not yet been discovered.

One notable example is the gap Mendeleev left for an element with an atomic weight of 72. He predicted that this element would have properties similar to titanium and zirconium. In 1875, 15 years after Mendeleev published his table, the element germanium was discovered, which fit perfectly into this predicted gap.

Another example is the gap for an element with an atomic weight of 101. Mendeleev predicted that this element would have properties similar to iodine. It wasn't until 1957 that the element named mendelevium (Md) was discovered, fulfilling Mendeleev's prediction.

These gaps in Mendeleev's periodic table demonstrated his ability to accurately predict the existence and properties of yet-to-be-discovered elements. They also highlighted the power and usefulness of his periodic table as a tool for organizing and understanding the elements.
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Read the passage given below and answer the following questions:The d block elements are the 40 elements contained in the four rows of ten columns (3-12) in the periodic table. As all the d block elements are metallic, the term d-block metals is synonymous. This set of d-block elements is also often identified as the transition metals, but sometimes the group 12 elements (zinc, cadmium, mercury) are excluded from the transition metals as the transition elements are defined as those with partly filled d or f shells in their compounds. Inclusion of the elements zinc, cadmium and mercury is necessary as some properties of the group 12 elements are appropriate logically to include with a discussion of transition metal chemistry. The term transition element or transition metal appeared to derive from early studies of periodicity such as the Mendeleev periodic table of the elements. His horizontal table of the elements was an attempt to group the elements together so that the chemistry of elements might be explained and predicted. In this table there are eight groups labeled I-VIII with each subdivided into A and B subgroups. Mendeleev recognized that certain properties of elements in Group VIII are related to those of some of the elements in Group VII and those at the start of the next row Group I. In that sense, these elements might be described as possessing properties transitional from one row of the table to the next.In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion (

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Gaps were left in Mendeleev’s Periodic Table to allow for the discovery of new elements in the future. Which of the following elements did not find a place in the Periodic Table until much later in history?a)Siliconb)Oxygenc)Fluorined)GermaniumCorrect answer is option 'D'. Can you explain this answer?
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