CBSE Class 9 Answered
how can we calculate the valency of elements having atomic number from 24-118
Asked by sanjeev.mami | 25 Dec, 2015, 10:44: AM
Expert Answer
Valency: It is the number of electrons lost or gained or shared by an atom to become stable.
Valency is determined on the basis of the urge to lose or gain or share electrons by the atom.
Transition elements show variable state oxidation in their compounds. Reason of variable oxidation state is that there is a very small energy difference in between (n-1)d and ns orbitals. As a result, electrons of (n-1)d orbitals as well as ns-orbitals take part in bond formation. Variation in oxidation state is related to their electronic configuration.
Example:
Chromium with atomic number 24 has variable valencies such as +1, +2, +3, +4, +5, +6.
Answered by Prachi Sawant | 28 Dec, 2015, 10:30: AM
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. Then i have to first react Carbon with Oxygen then react that compond with calcium. So how will i know the valency of compound formed from reaction of carbon with oxygen. We can know the valency of elements from their atomic number and electronic configuration, but how can i know the valency of compound?
Please help,waiting for your reply,
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