mhchem package does not work

Hi everyone,

I have a problem with the mhchem package. I tried to use it but when I want to use the \ce command in my document it does not appear in the drop down list. Somehow although including the mhchem package the macros are not recognized.

Does anyone know this problem and could be of help?

I use the following packages:

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[onehalfspacing]{setspace}
\usepackage{siunitx}
\usepackage{expl3}
\usepackage{calc}
\usepackage[version=4]{mhchem}


\usepackage{amsmath,amsthm,amssymb,amsbsy,wasysym,mathtools}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}


Many thanks.

Siau


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