Changing "and" to & in chem-acs style biblatex

Question

I wrote my thesis in a latex template, and it had the chem-acs style by default in the references. It is in spanish, and the problem is that it puts "y" when it shows the last author and shows all the authors of the article, and when I remove the last of them and put "and others", it puts "y col" (which means and colaborators, in spanish). I want to keep the same style of references (chem-acs), but instead of what I mentioned, I need it to show only the first three authors, and if there are more, to put et al, not y col. Also, I need to have an ampersand (&) instead of y before the last author. I already tried this answer and this one, but nothing works. This is the part of template regarding the references (in the .cls).

\usepackage[style = chem-acs, backend=biber, urldate=long,
            dateabbrev=false]{biblatex}
\addbibresource{References/references.bib}
\renewcommand{\bibname}{References}

This is what I have in references.tex

\addcontentsline{toc}{chapter}{\protect \textbf{Referencias}}
\nocite{*}
\renewcommand{\bibname}{Referencias}           
\printbibliography

I would be grateful if someone could help me

Answer 1

The number of names shown can be controlled with minnames and maxnames. (Name lists exceeding maxnames are shortened to minnames+"et al.".)

The "&" between the last and second-to-last author can be obtained by redefining finalnamedelim, but if you are writing in a language with smartand feature (such as spanshs), you also need to reset an internal macro for that to work properly.

You get the "et al." by redefining the andothers bibstring.

\documentclass[spanish]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{csquotes}
\usepackage[backend=biber,
  style=chem-acs,
  minnames=3, maxnames=3,
]{biblatex}
\DeclareDelimFormat{finalnamedelim}{\addspace&\space}
\makeatletter
\DefineBibliographyExtras{spanish}{%
  \restorecommand\lbx@finalnamedelim
}
\makeatother
\DefineBibliographyStrings{spanish}{
  andothers = {et\addabbrvspace al\adddot},
}
\addbibresource{biblatex-examples.bib}
\begin{document}
\cite{sigfridsson,aksin,nussbaum}
\printbibliography
\end{document}