Question

The statement that is not true for the long form of periodic table is-

• A. It helps to predict the stable valency states of the elements
• B. .It reflects the physical and chemical properties of the elements
• C. It helps to predict the relative ionicity of bond between any two elements
• D. It reflects the sequence of filling the electrons in order

Answer 1

Answer: (A)

Explanation for correct option ​

The Periodic table can be helpful to predict the valencies of elements but it cannot predict the stable valency, therefore option (D) is incorrect.

Explanation of incorrect options.

1. It helps to predict the relative ionicity of the bond between any two elements is a correct statement because the compounds of left and right portions of elements in the periodic table are more ionic and the middle is covalent.

2. It reflects the sequence of filling the electrons in the order of sub-energy levels s,p,d and f is the correct statement as the periodic table is classified into s,p,d & f block elements based on the sequence of filling the electrons in the order of sub-energy levels s,p,d and f respectively.

3. It reflects trends in physical and chemical properties of the elements is a correct statement because they were classified based on the atomic number and successive element's atomic number difference is 1 unit.

Conclusive statement- option (D) is correct.