Coronium
Appearance
![](https://cdn.statically.io/img/upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Solar_eclipse_1999_4.jpg/220px-Solar_eclipse_1999_4.jpg)
Coronium was thought to be a chemical element in 1882. The evidence was a thin green spectrometry line in the solar corona. In 1930, it was proved that it did not exist. The green line was just highly ionized iron, (Fe13+), which is now called coronium.