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Which fact is not valid for Dobereiner's triads?

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Important Questions on Classification of Elements and Periodicity in Properties

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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 28
Which of the following statements is incorrect from the point of view of modern periodic table?
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 29
The elements are expressed in terms of their atomic numbers. Which of the following group of elements belongs to alkali metals?
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 30
Which of the following elements will form acidic oxide?
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 31
Which one of the following is most electropositive element?
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 33
As you move down the group, the alkali metals become _____.
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 34
Which is a metalloid?
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 35
Which one of the following elements exhibit maximum number of valence electrons?
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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 36
Which of the following elements does not lose an electron easily?