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Poor shielding of nuclear charge by d or f-orbital electrons is responsible for which of the following facts?

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Important Questions on Periodic Table & Periodicity

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 8 - Periodic Table & Periodicity>EXERCISE>Q 23
Select equations having endothermic step:
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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 8 - Periodic Table & Periodicity>EXERCISE>Q 24
Which is not the correct order for the properties specified?
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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 8 - Periodic Table & Periodicity>EXERCISE>Q 25
The group in which all the elements does not have the same number of electrons in their valence shell is _______.
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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 8 - Periodic Table & Periodicity>EXERCISE>Q 26
The elements which exhibit both the vertical and horizontal similarities are
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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 8 - Periodic Table & Periodicity>EXERCISE>Q 27
Which of the following is the atomic number of a metal with group number 2?
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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 8 - Periodic Table & Periodicity>EXERCISE>Q 28
Of the following pairs, the one containing examples of the metalloid elements in the periodic table is:
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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 8 - Periodic Table & Periodicity>EXERCISE>Q 29
Which group of the elements is analogous to the lanthanoids ?
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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 8 - Periodic Table & Periodicity>EXERCISE>Q 30
With respect to the oxygen maximum oxidation state is shown by ______.