Question

You can have one atom of _____. A) iron oxide B) krypton C) water D) carbon monoxide

Answer 1

A) is incorrect, as iron oxide is a compound of iron and oxygen.

C) is incorrect, as water is a compound of hydrogen and oxygen.

D) is incorrect, as carbon monoxide is a compound of carbon and oxygen.

That leaves B. Krypton exists as individual atoms, so this answer is correct.

The important thing to note here is that you can't have a single atom of a compound, since a compound is necessarily made up of several atoms.

Answer 2

thanks!