prysm/svg/atoms/ion-ion.svg

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 48" width="24" height="48">
  <!-- 0-atoms/ion/ion -->
  <!-- prysm atom, acid palette -->
  <rect id="ion" x="0.0" y="0.0" width="23.9" height="48.0" style="fill:#00fe00"/>
</svg>