Classification Of Elements And Periodicity In Properties Ques 175
Question: The statement that is true for the long form of the periodic table is [IIT 1988]
Options:
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 bonds between any two elements
E) All of the above
Show Answer
Answer:
Correct Answer: E
Solution:
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.
