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Explain the following observation: (i)...

Explain the following observation:
(i) Generally there is an increase in density of elements from titanium `(Z=22)`to copper `(Z=29)` in the first series of transition elements.
(ii) Transition elements and their compounds are generally found to be catalysts in chemical reactions.

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(i) Due to decrease in size and incresing mass.
(ii) Beacause of variable oxidation states exhibited by them.
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