Transition metals are not characterized by

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(A) Transition metals are characterized by variable valency,not fixed valency. This is due to the participation of both $(n-1)d$ and $ns$ electrons in

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fixed valency

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(A) Transition metals are characterized by variable valency,not fixed valency. This is due to the participation of both $(n-1)d$ and $ns$ electrons in bonding because their energy levels are very close. They form coloured compounds due to $d-d$ transitions. They have high melting and boiling points due to strong metallic bonding involving $d$-electrons. They have a high tendency to form complexes due to the availability of vacant $d$-orbitals and high charge-to-size ratio.

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