\series default
・
\series bold
+mathdots
+\series default
+・
+\series bold
mhchem
\series default
・
\series default
LaTeX limits the number of matrix columns with decorations to 10.
If you need more than 10
-\begin_inset space \thinspace{}
+\begin_inset space ~
\end_inset
columns, you have to add this line to the document preamble: