The d-And-f-Block Elements

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Explain why iron is a transition element but sodium is not?

Iron is transition element but sodium is not because of the differentiating electron i.e. last incoming electron in iron acquires 3d orbitals to give [Ar] 3d6, 4s2 configuration with incomplete d-sub-shell, the characteristic of transition. In Na, the differentiating electron occupies 3s1 subshell to give [Ne] 3s1 configuration. 
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    Why does Zr and Hf exhibit similar properties?

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    Atomic radius in a transition series does not vary much while that of s and p-block does. Why?
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    Why Pd is not called a transition elements?
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    Name a transition element which does not exhibit variable oxidation states.

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    Why is the enthalpy of atomisation increases upto the middle of the transition series and then decreases?
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    Why is the density of Zn lower than that of Cu?
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    Why are Zn, Cd and Hg softer and volatile metals?
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    Why do the transition elements exhibit higher enthalpies of atomisation?

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    Why is the following electronic configuration not correct for the ground state of Mo atom? (at. no. = 42).
    1s2 2s2 2p6 3s23p63d10 4s2 4p6 4d4 5s2.

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