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  • 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

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
(a) (i) only   
(b) (i), (ii) and (iii)
(c) (i), (ii) and (iv)  
(d) (iv) only 

Answers (1)

Ans.(b)
Sol.
(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number – Incorrect as the elements in periodic table are arranged according to increasing atomic number.
(ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses – Incorrect as atomic mass was the criteria for Mendeleev’s periodic table.
(iii) Isotopes are placed in adjoining group (s) in the Periodic Table – Incorrect as isotopes have same electronic configuration and thus they are placed in the same group.
(iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number – Correct.

Hence option (b) is correct.

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