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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] 3d 6 , 4s 2 configuration with incomplete d-sub-shell, the characteristic of transition. In Na, the differentiating electron occupies 3s 1 subshell to give [Ne] 3s 1 configuration.

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The d-And-f-Block Elements

Short Answer Type

21. Why Pd is not called a transition elements?

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22. Why is the density of Zn lower than that of Cu?

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23. Atomic radius in a transition series does not vary much while that of s and p-block does. Why?

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24. 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] 3s¹configuration.

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