Saved Bookmarks
| 1. |
Explain briefly how +2 state becomes more and more stable in the first half of the first row transition elements with increasing atomic number? |
|
Answer» Solution :Element (+2 state)`""_(21)Se^(2+) ""_(22)Ti^(2+) ""_(23)V^(2+) ""_(24)Cr^(2+) ""_(25)MN^(2+)` Electronic configuration `3D^1 3d^2 3d^3 3d^4 3d^5`. In all the elements listed, the removal of two 4S-electrons (in `Cr^(2+)`, i.e., from 4s and LE from 3d), the 3d-orbitals get gradually occupied. Since, the number of empty d-orbitals increases with increase in ATOMIC number of cations, so the stability of the cations `(M^(2+))` increases from `Sc^(2+)` to `Mn^(2+)`. |
|