hydrogen is most commonly found as a part of water with oxygen.
this is a guess but beryllium?
No, iron is an element. Chrmium is also an element, so there are no other substances, compounds or otherwise, that are found in it. However, there are alloys that contain both iron and chromium along with other metals.
I think it is hydrogen
Oxygen is the most commonly found element as part of a compound with another element. This is because oxygen has a high electronegativity and readily forms chemical bonds with other elements. Additionally, oxygen is abundant in the Earth's atmosphere, making it readily available for chemical reactions.
Oxygen is an element, as it is found on the periodic table with the atomic number 8. It can form compounds with other elements, such as water (H2O) and carbon dioxide (CO2), but it itself is not a compound or mixture.
chlorine is not a compound. it is an element.
Silicon is an element. It is not usually found as silicon but as a compound that makes up quartz.There is often a confusion with silicone which is a synthetic substance made up of silicon, oxygen and other elements, mostly carbon and hydrogen. Silicone is generally a liquid or a flexible, rubberlike plastic and it is often used in shampoo.
Sodium, as in the element Na, is not a compound.Salt, on the other hand, such as table salt, is NaCl.
Calcium is a chemical element not a compound.
Neon is one of those elements that it's practically impossible to combine with any other element to make a compound. Like neon, argon, and krypton, it's found as a pure element in nature.
No, silicon (Si) is not a covalent compound itself; it is an element. However, silicon can form covalent compounds when it bonds with other elements. Silicon is commonly found in covalent compounds such as silicon dioxide (SiO2) and silicon tetrafluoride (SiF4).
Sulfur is not a highly reactive element under ordinary condition.