MCQ
Going from $K-$shell to $N-$shell in case of $H-$atom :
- ✓$K.E.$ decreases
- BTotal energy decreases
- CPotential energy decreases
- DNone of the above
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$2CrO_4^{2 - } + 2{H^ + } \to C{r_2}O_7^{2 - } + {H_2}O$
$(I)\,[Xe]\, 6s^1$ $(II)\,[Xe]\,4f^{14}\,5d^1\,6s^2$
$(III)\,[Ar]\,4s^2\,4p^5$ $(IV)\,[Ar]\,3d^7,\,4s^2$
Select the incorrect statement about these elements