Helium is chemically inert and does not combine with any other element (including thallium).
Helium is inert and doesn't react with any other elements.
That would happen after it loses a certain amount of helium.
Thallium has an oxidation number of +1. Therefore, the formula for thallium carbonate would be Tl2CO3.
the lighted splint would stop burning as Helium does not burn.
it would be cray.
The reaction in the sun which gives us energy involves helium. If helium didn't exist we would receive no energy and life wouldn't exist on the earth.
Nothing
If you pour liquid helium into liquid nitrogen, the helium will not mix with the nitrogen and will instead form separate layers. Helium is lighter than nitrogen and has a lower boiling point, so the helium will tend to float on top of the nitrogen.
Aluminum would be more like sulfur as they are both nonmetals. Thallium, on the other hand, is a metal.
The symbol for sodium is Na, for iron it is Fe, for aluminum it is Al, and for helium it is He. Sodium, iron, and aluminum are elements on the periodic table, while helium is a noble gas. If you're looking for a combined symbol for sodium, iron, aluminum, and helium together, it would be NaFeAlHe.
Thallium is an element on the periodic table. It's atomic number is 81.Because it is an element, I don't understand what you mean by "its formula".The symbol for Thallium is Tl, so the formula would be Tl...If you want the formula for a compound with thallium, that's a different story.It is not a diatomic element, if that's what you meant.For more information on thallium, go tohttp://en.wikipedia.org/wiki/Thallium
When combined with fluorine, helium would produce the most nonpolar covalent bond. This is because helium has a full valence shell with two electrons, making it highly stable and unlikely to share electrons with fluorine.