Question

Which of the following statements is/are true for the long form of the periodic table?

• A. It reflects the sequence of filling the electrons in the order of sub-energy levels $s,p,d$ and $f$
• B. It helps to predict the stable valency states of the elements
• C. It reflects trends in physical and chemical properties of the elements
• D. It helps to predict the relative ionicity of the bond between any two elements

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A It reflects the sequence of filling the electrons in the order of sub-energy levels $s,p,d$ and $f$
B It helps to predict the stable valency states of the elements
C It reflects trends in physical and chemical properties of the elements
D It helps to predict the relative ionicity of the bond between any two elements

A) It reflects the sequence of filling the electrons in the order of sub-energy levels $s,p,d$ and $f$ is 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.
B) It helps to predict the stable valency states of the elements.is a wrong statement because it cant predict stable valencies.
C) 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.
C) 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 middle are covalent.