valency and use of valency

Discussion in 'CBSE Class 9 Chemistry Help' started by Ramana Viparth, Jan 4, 2012.

  1. Valency is the combining capacity of an element. It can be used to find out how many atoms of an element will combine with the other element to form a chemical formula. For example, hydrogen has a valency + I and chlorine has a valency —1, so one atom of hydrogen combines with one atom of chlorine to form hydrochloric acid HCl). Oxygen has a valency —2, so one atom of oxygen combines with two atoms of hydrogen to form water molecule (H2O).

    Read More on Valecny:
    Define valency.
    How is valency of an element found? Find the valency of chlorine, sulphur, silicon and magnesium.
    'He' and 'Ne' have zero valency.
    The valency of Na is 1 and not 7. Give reason.
    Write valency of potassium in the compound K2C03.
    Why helium gas is considered as chemically inert? Explain.

    Last edited by a moderator: Sep 8, 2014
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