Saved Bookmarks
| 1. |
What are chemical twins ? Give examples. |
|
Answer» Solution :(1) A pair of elements having similar properties due to similar atomic RADII are called chemical TWINS and they are d-block elements of 5TH and 6TH period or 4d-series and 5d-series respectively. (2) They are Zr and Hf, Nb and Ta, Mo and W, Tc and Re. (3) This effect arises due to lanthanoid contraction. Twin elements : `|{:("Zr (145 pm)","Nb (134 pm)","Mo (129 pm)","Tc (114 pm)"),("Hf (144 pm)","Ta (134 pm)","W (130 pm)","Re (114 pm)"):}|` |
|