define chemical twins
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twins - (mineralogy) two interwoven crystals that are mirror images on each other. mineralogy - the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them. crystal - a solid formed by the solidification of achemical and having a highly regular atomic structure. 2 .
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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.
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