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Write down the electronic configuration of: `Co ^(2+)`

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The correct Answer is:
`r_+ =126 Å , r_(-)=171 Å`
`pH=1/2xx[pK_w-pK_b-log C]implies 4.85\1/2xx[14-4.7-log C]implies C=0.4`
`:. C=0.4=(5.34)/("molar mass")xx4 implies` molar mass of the salt=53.5gm/mole
Now, density`=(1xx53.5)/(6.022xx10^(23)xxa^3)=2.2 " " implies " " a=3.43xx10^(-8)` cm
and for CsCl type of crystals, `sqrt3a=2(r_(+)+r_(-))`
`implies " " r_(+)=1.26xx10^(-3)cm and r_(-)=1.71xx10^(-8) cm`
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