Question

An atom that has lost or gained electrons is known as an ion. Which compound below is made up of ions? A) CH4 B) CO C) KBr D) SO3

Answer 1

I’m not sure if this is right but:
Ionic compounds don’t share electrons, so they take the electrons from each other.
So for an atom to gain or lose electrons it has to be ionic. The only ionic compound out of those choices is potassium bromide (KBr)

Answer 2

Answer: $KBr$

Explanation: An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron forms cations and the element which accepts the electrons forms anions. This bond is formed between a metal and an non-metal.

Covalent bonds are formed by sharing of electrons between non metals.

$CH_4$, $CO$ and $SO_3$ are all covalent compounds.

$KBr$ is an ionic compound formed by combination of $K^+$ which is formed by loss of one electron by potassium and $Br^-$ which is formed by gain of one electron by bromine.