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periodic classification of elements — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Scienceperiodic classification of elements1 Mark
Question
How do you calculate the valency of an element from its electronic configuration?
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Answer

  • The valency of an element is determined by the number of valence electrons present in the outermost shell of the atom.
  • For elements of group $1, 2, 13$ and $14$, the valency is equal to the number of valence electrons and for elements of group $15, 16, 17$ and $18,$ the valency is equal to $8$ minus number of valence electrons.

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