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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?

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25.

Why do the transition elements exhibit higher enthalpies of atomisation?

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26. Why is the enthalpy of atomisation increases upto the middle of the transition series and then decreases?

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27. Why are Zn, Cd and Hg softer and volatile metals?

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28.

Why does Zr and Hf exhibit similar properties?

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Half filled orbitals have extra stability. Therefore, the correct configuration is:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰4s² 4p⁶ 5s¹ 4d⁵

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30.

Name a transition element which does not exhibit variable oxidation states.

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