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How many elements were known when Mendeleev started his work on his periodic table?
  • a)
    63
  • b)
    55
  • c)
    69
  • d)
    45
Correct answer is option 'A'. Can you explain this answer?
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How many elements were known when Mendeleev started his work on his pe...
There were 63 known elements in 1860 when Mendeleev published his Periodic Table. CIENTISTS HAD IDENTIFIED over 63 elements by Mendeleev's time. 
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How many elements were known when Mendeleev started his work on his pe...
There is 63 element because Mendel put element according to their mass volumes

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Number of Elements Known During Mendeleev's Work

The correct answer is option 'A', 63 elements were known when Mendeleev started his work on his periodic table.

Explanation


  • When Mendeleev began working on his periodic table in the 1860s, there were 63 known elements.

  • These elements had been discovered and characterized through various scientific studies and experiments.

  • Mendeleev's goal was to organize these elements in a way that would reveal patterns and trends in their properties and help predict the existence of undiscovered elements.

  • His periodic table, which he published in 1869, arranged the elements by their atomic weights and grouped them based on their similar properties.

  • Through his work, Mendeleev successfully predicted the properties of missing elements and left gaps in his table for them.

  • His periodic table laid the foundation for the modern periodic table that we use today, which has been expanded to include over 100 elements.

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Read the passage and answer the questions :Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of their atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.Q. Mendeleev arranged the periodic table on the basis of their fundamental property

Read the passage and answer the questions :Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of their atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.Q. Mendeleev’s periodic table has

Read the passage and answer the questions :Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of their atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.Q. The elements eka aluminium and eka silicon discovered by Mendeleev later found place in the periodic table. Both of these elements belong to

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How many elements were known when Mendeleev started his work on his periodic table?a)63b)55c)69d)45Correct answer is option 'A'. Can you explain this answer?
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