% Bohr atom model
% Author: Stefan Kottwitz
% https://www.packtpub.com/hardware-and-creative/latex-cookbook
\documentclass[border={-370pt 10pt 10pt 10pt}]{standalone} 
%%%<
\usepackage{verbatim}
%%%>
\begin{comment}
:Title: Bohr atom model
:Tags: Chemistry;Physics;Graphics;TikZ;bohr;Chapter11
:Author: Stefan Kottwitz
:Slug: atoms

In other examples, we saw how to draw molecules. How about
digging deeper? Can we draw atoms? Sure!

We will use a package named after the famout physicist
Niels Bohr. That's bohr.sty.

Here, we will draw Fluorine and a Sodium ion.

The code is fully explained in the LaTeX Cookbook, Chapter 11,
Science and Technology, Representing atoms.
\end{comment}
\usepackage{bohr}
\begin{document}
\bohr{10}{F}
\setbohr{nucleus-radius=1.5em}
\bohr[3]{10}{$\mathrm{Na^+}$}
\end{document}