Answer
$0.197\ nm$
$197\ pm$
Work Step by Step
In nanometers
$1.97\dot{A}\times \dfrac{1\times10^{-10}\ m}{1\ \dot{A}}\dfrac{1\ nm}{1\times10^{-9}\ m}=0.197\ nm$
In picometers
$1.97\dot{A}\times \dfrac{1\times10^{-10}\ m}{1\ \dot{A}}\dfrac{1\ pm}{1\times10^{-12}\ m}=197\ pm$
