How did the scientists know that the elements in periodic table occur in nature?

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Solution

Nobody knew anything, the discovery of elements are based on experiments. However, Mendeleev predicted the existence of certain elements on the basis of the periodic trends he observed in his periodic table.

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Similar questions

Q. How did Mendeleev predict the existence of some elements yet to be discovered elements in his periodic table?

Q. Which important property did Mendeleev use to classify the elements in his Periodic Table, and did he stick to that?

Q. In the periodic table, almost every isotope of the elements after the element , are radioactive in nature.

Q. Which scientist came up with the concept of a periodic table that included all of the known elements?

(a) What is a period in a periodic table? How do atomic structures (electron arrangements) change in a period with the increase in atomic numbers from left to right?

(b) How do the following change on going from left to right in a period of the periodic table?

(i) Chemical reactivity of elements (ii) Nature of oxides of elements

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