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What Are Chemical Twins? Write ‘Two’ Examples. - Chemistry

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One Line Answer

What are chemical twins? Write ‘two’ examples.

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Solution

Chemical twins are those in which the properties of some elements are same. Atomic size of  Zr and Hf ,  Nb and Ta are similar. This is due to Lanthanide contraction.
Example - Zr and Hf ; Nb and Ta

Concept: F-block Elements - The Lanthanoids
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