Q2 of 52 Page 38

According to Mendeleev's Periodic Law, the elements were arranged in the periodic table in the order of

Dmitri Ivanovich Mendeleev was a Russian scientist. He arranged the elements in increasing order of their relative atomic masses. This law states that the properties of elements are the periodic function of their relative atomic masses.

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1

Upto which element, the Law of Octaves was found to be applicable.

 3

In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later?

 4

Which of the following statement(s) about the Modern Periodic Table are incorrect?

(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number.


(ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.


(iii) Isotopes are placed in adjoining group (s) in the Periodic Table.


(iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number.

 5

Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?