Answer
$\frac{1}{2}$
Work Step by Step
The nth term of a geometric series can be obtained by the following formula: $a_n=a_1\cdot r^{n-1}$, where $a_1$ is the first term and $r$ is the common ratio.
Hence here: $a_6=16\cdot(\frac{1}{2})^{6-1}=16\cdot\frac{1}{32}=\frac{1}{2}$