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Q:

German chemist John Doreiner was the first to indicate that there is a definite tendency in the properties of elements. In which year did he say this?

  • 1
    In the early decades of 1800
  • 2
    In the early decades of 1900
  • 3
    In the early decades of 1700
  • 4
    None of these
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Answer : 1. "In the early decades of 1800"
Explanation :

In the history of the periodic table, the German scientist Dobereiner (1817) created a triad of three elements, which when placed in ascending order of atomic mass, the atomic mass of the middle element is approximately the average of the atomic masses of the other two elements. This rule is called Döbereiner's rule of tries.

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