They are known to have a juicy green color. But when they suddenly turn yellow, something seems wrong. What can be behind it, if the radiate aralie gets yellow leaves?

Wrong location or wrong maintenance
Yellow leaves on the Schefflera can occur, among other things, with:
- existing nutrient deficiency
- Pest infestation (e.g. spider mites, aphids)
- too much direct sunlight
- too dark location
- root rot (too wet soil)
Drop or cut off
When the leaves have completely turned yellow, they will soon be shed. Alternatively, you can cut them off beforehand if the image bothers you. However, to avoid not turning all the leaves yellow, you should reconsider the location and care!
tips
Yellow leaves are not always a bad sign. There are also schefflera varieties that have yellow shaded or variegated leaves.