Helium was discovered in the Sun by the French chemist Jules Janssen (18.08.1868) studying the spectra of Sun during an eclipse. He observed a new unknown line at 587,49 nm - this is a specific spectral line for helium.
If they are undiscovered we do not know of them.
If they are "undiscovered," then no one can really know.
Ununbiquadium is an undiscovered element with an atomic number of 1124.
The sun's main present element is hydrogen.
Hydrogen is the most common element in the universe, and in the Sun.
The as yet undiscovered and fictional element hugeonium will have many electrons, possibly in excess of 125.
Mendeleev used the term "eka-aluminum" to predict the properties of an undiscovered element that would have similar characteristics to aluminum. This was part of his periodic table where he left gaps for undiscovered elements. Eka-aluminum was later discovered and named gallium, confirming Mendeleev's periodic trends.
Uranium ... I think. I don't quite know what you're asking here.
The element Hydrogen .
The element named after the Greek name for the sun is Helium.
Undiscovered is an adjective.
The Undiscovered was created in 1997.