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Explain the cause of chemical similarity...

Explain the cause of chemical similarity between the compounds of Nb and Ta.

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Nb (a member of 4d-series) and Ta (a member of 5d - series) are transition metals belonging to Gr-5 of the periodic table. They have similar atomic atomic radii (for explanation see 'variation of atomic radii', article no. 8.4.3) and hence they have very similar chemical properties.
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