Helium is inert and doesn't react with any other elements.
Helium Oxide would be a compound of 2 elements: helium and oxygen but no such compound exists. Oxygen is just oxygen and nothing else. It is an element in its own right.
Helium is chemically inert and does not combine with any other element (including thallium).
Alloys would be formed when metal will be combined with non metals.
If aluminum and calcium were to combine, the resulting compound would likely be a binary ionic compound with the formula Al2Ca3. This compound would consist of aluminum ions (Al3+) and calcium ions (Ca2+) combined in a 2:3 ratio to achieve a neutral charge.
Helium Oxide would be a compound of 2 elements: helium and oxygen but no such compound exists. Oxygen is just oxygen and nothing else. It is an element in its own right.
Iron could be a compound if you combined it with carbon. Then it would just be a alloy. Overall, iron is not a compound at all. It is an element.
Jupiter is formed from hydrogen and helium, it is a gas giant.
Two substances that are chemically combined are called a compound. It is a substance that is made up of two or more different elements chemically bonded together in a fixed ratio.
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.
A combination of two or more substances that are chemically combined is called a compound. Compounds have a fixed composition and can be broken down into simpler substances through chemical reactions.
A compound is formed when two or more other substances are combined and a chemical change takes place. Pure water would be an example of a compound.
It isn't a element, as an element is one atom. It would be a compound if the elements chemically combined, but if they didn't, its a misture