Oxygen
Yes, elements and compounds can exist separately.
A compound must have at least two atoms of different elements.
No. Nebulae exist in almost every galaxy.
The compound NH does not exist. However, if you are asking about the compound ammonia (NH3), it is composed of nitrogen and hydrogen atoms.
The compound 3CACl2 does not exist. However, if you meant to say 3CaCl2, it would consist of calcium (Ca) and chlorine (Cl) elements.
A compound is a substance made up of two or more different types of atoms that are chemically bonded together. These atoms can be from different elements or the same element. The properties of a compound are different from the properties of the individual elements that make it up.
"Atoms" of the compound iron oxide do not exist, but the compound contains iron and oxygen atoms, both in the form of ions.
"Atoms" of the compound iron oxide do not exist, but the compound contains iron and oxygen atoms, both in the form of ions.
The elements are boron and oxygen. The number of atoms is 3.
No, it is a compound. Compounds are made up of elements, and elements are made up of atoms.
the empirical formula of a compound tells you the proportions of the elements in the compound. with that information you can make some inferences about the identity of the compound. for example a compound with an empirical formula CH4 tells us that for every carbon atom there are four hydrogen atoms. this means that the compound is methane because no other hydrocarbon can have these roportions (try drawing the lewis structure for C2H8, which doesnt exist. you cant!)
Some elements occur in nature in a pure form, and not as part of a compound with other elements. Elements such as copper, silver, and gold are also minerals. Almost all pure, solid elements are mentals.