Q3 of 52 Page 38

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?

In 1869, after Newlands Octave Law was rejected, Mendeleev Periodic table was introduced. In this periodic table, elements were arranged on the basis of their atomic masses. A few gaps were left for the elements to be discovered later. Later, Gallium (Ga) and Germanium (Ge) were found that had same properties as eka–aluminum and eka–silicon, respectively.

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1

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

 2

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

 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?