Can you suggest an easy way to draw atoms? [duplicate]

Can you suggest an easy way to draw these atoms?

\documentclass{standalone}
\usepackage{tikz,graphicx}
\usetikzlibrary{decorations.markings}
\definecolor{myyellow}{RGB}{254,241,24}
\definecolor{myorange}{RGB}{234,125,1}
\begin{document}

\begin{tikzpicture}
\def\proton(#1,#2){%
\node at (#1,#2) {\texttt{+}};
}
\def\neutron(#1,#2){%
}
\def\electron{%
\node at (0,0) {\texttt{-}};
}
\def\sorbit(#1,#2){%
\draw[
color=violet,
rotate=#1,
postaction=decorate,
decoration={markings,
mark=at position #2 with {\electron},
}]
(0,0) ellipse (1.5 and 3.5);
}
\def\porbit(#1,#2){%
\draw[
color=violet,
rotate=#1,
postaction=decorate,
decoration={markings,
mark=at position #2 with {\electron},
}]
(0,0) ellipse (4 and 6);
}
%%Nucleons
\neutron(0.8,0.2)
\proton(0.5,-0.5)
\neutron(-0.25,-0.5)
\neutron(0.55,0.8)
\proton(-0.5,0.2)
\proton(-0.1,0.8)
\proton(0.5,0)
\proton(0.12,0.6)
\proton(0.12,-0.6)
\neutron(-0.25,0)
\neutron(-0.5,0.6)
\neutron(0.5,-0.3)
%%orbits
\porbit(-20,.15)
\porbit(15,.45)
\sorbit(40,.9)
\porbit(65,.6)
\sorbit(100,.3)
\porbit(125,.75)

\end{tikzpicture}

\end{document}

• Questions about how to draw specific graphics that just post an image of the desired result are really not reasonable questions to ask on the site. Please post a minimal compilable document showing that you've tried to produce the image and then people will be happy to help you with any specific problems you may have. See minimal working example (MWE) for what needs to go into such a document. – cryingshadow Jan 5 '16 at 15:21
• If someone has drown a similar athom I can try to change the code. – ryuk Jan 5 '16 at 15:23
• take a look at this answer tex.stackexchange.com/a/281814/23166 for drawing atoms and lines ;) – Davide Jan 5 '16 at 15:23
• yes. But when I compile there is an error :( – ryuk Jan 5 '16 at 15:48
• This is clearly a duplicate of the question linked to in Chris's answer. If your question is about a particular problem you have with the code there, then rework your question to be much more focused on the code itself. – Alan Munn Jan 5 '16 at 15:48

The answers to Draw Bohr atomic model with electron shells in TeX? have some examples that could serve as a starting point. The code of some examples there will not compile out of the box on recent TeX distributions. You have to replace shade=ball with shading=ball on several lines. I guess this is because the TikZ syntax changed over time.
• Try adding \usetikzlibrary{shadings} after the first \usetikzlibrary. – Chris Jan 5 '16 at 15:41
• Replace shade=ball with shading=ball in the orginal code. \usetikzlibrary{shadings} should not be needed. – Chris Jan 5 '16 at 15:49