Answer
$8.3\times10^{-4}$
Work Step by Step
Using $a\times10^n$, where $1\le a\le9,$ and $n$ is an integer, the scientific notation of the given expression, $
0.00083
,$ is
\begin{array}{l}\require{cancel}
8.3
\div10,000
\\\\=
8.3\times10^{-4}
.\end{array}