State the method of determining the valency of an element if its atomic number is given

CBSE Class 9 CBSE Class 9 Science
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  • State the method of determining the valency of an element if its atomic number is given.
  • Determine the valency of the following elements, the atomic numbers of which are given in parenthesis:
    Chlorine (17), Sulphur (16), Aluminium (13)

Answer:

  • The number of electrons gained, lost or shared to make the octet of electrons (in the outermost shell), gives us directly the combining capacity of the element, that is, the valency.
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