2

enter image description here

@Misc{APAWeb,
  title        = {{Socioeconomic Status}},
  howpublished = {{https://www.apa.org/topics/socioeconomic-status/}},
  note         = {{Accessed: 2019-02-16}},
  url          = {https://www.apa.org/topics/socioeconomic-status/},
  urldate      = {2019-02-16},
}


\documentclass[a4paper,12pt]{elsarticle} 
\usepackage{graphicx} 
\usepackage{amssymb} 
\usepackage{lineno} 
\usepackage{multirow} 
\usepackage{multicol} 
\usepackage{threeparttable} 
\usepackage{lscape} 
\usepackage{gensymb} 
\usepackage{textcomp} 
\usepackage{mhchem} 

\bibliographystyle{model1-num-names} 
\bibliography{XYZ.bib}
  • Please add a MWE. Welcome to TeX.SE. – Raaja Mar 23 at 7:24
1

The ???? issue arises because the model1-num-names bibliography style expects to find a non-empty year field in an entry of type @misc. The entry at hand contains a field called urldate, but none called year.

Given that the model1-num-names bibliography style does know what to do with a field called url, you should probably delete the redundant howpublished field. (If you do decide to keep the howpublished field, you should encase its contents in a \url directive if the contents consist of a URL string.)

enter image description here

\RequirePackage{filecontents}
\begin{filecontents}{XYZ.bib}
@Misc{APAWeb,
  title         = {{Socioeconomic Status}},
  xhowpublished = {\url{https://www.apa.org/topics/socioeconomic-status/}},
  note          = {{Accessed}: 2019-02-16},
  url           = {https://www.apa.org/topics/socioeconomic-status/},
  xurldate      = {2019-02-16},
  year          = 2019,
}
\end{filecontents}

\documentclass[a4paper,12pt]{elsarticle} 
%% I've commented out all preamble instructions 
%% that are irrelevant to the problem at hand.
%\usepackage{graphicx} 
%\usepackage{amssymb} 
%\usepackage{lineno} 
%\usepackage{multirow} 
%\usepackage{multicol} 
%\usepackage{threeparttable} 
%\usepackage{lscape} 
%\usepackage{gensymb} 
%\usepackage{textcomp} 
%\usepackage{mhchem} 
\bibliographystyle{model1-num-names} % from https://www.elsevier.com/authors/author-schemas/latex-instructions
\usepackage{xurl} % allow line breaks anywhere in a URL string

\begin{document}
\cite{APaWeb}
\bibliography{XYZ} % don't inlcude the ".bib" extension
\end{document}

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