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Solution


Q.

Which of the following statements are NOT true about the periodic table                                   [2025]

(A) The properties of elements are function of atomic weights.

(B) The properties of elements are function of atomic numbers.

(C) Elements having similar outer electronic configurations are arranged in same period.

(D) An element’s location reflects the quantum numbers of the last filled orbital.

(E) The number of elements in a period is same as the number of atomic orbitals available in energy level that is being filled.

Choose the correct answer from the options given below:
1 (B), (C) and (E) Only  
2 (A) and (E) Only  
3 (D) and (E) Only  
4 (A), (C) and (E) Only  

Ans.

(4)

(A)(B) Properties of elements are periodic function of atomic number, not atomic mass.

(C) Elements with similar outer electronic configuration are arranged in same group.

(D) An element present in 4th period, p block will have last electron filled in 4p orbital, so an element’s location in periodic table reflects the quantum numbers of last filled orbital.

(E) In third period there are 8 elements but third shell has 9 orbitals.