Which is a metalloid?

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 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?

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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 37

To which block is related an element having an $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^1$ electronic configuration in the periodic table _____.

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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 38

If the valence shell electronic configuration for an element is $n{s}^{2}n{p}^5,$ this element will belong to the group of _____.

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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 39

Which shows variable valency _____.

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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 40

The noble gases are unreactive because _____.

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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 41

Which scientist came up with the concept of a periodic table that included all of the known elements?

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General Science for Competitive Exams>Chapter 11 - Classification of Elements and Periodicity in Properties>EXERCISE>Q 42

If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is _____.