The valency shell of element A contains three electrons, while the valence shell of element B contains six electrons. If A and B combines the probable formula of compound is
AB2
A2B
A2B3
A3B2
i think option 3 is correct
A have charge of 3+ and B have the charge of 2- so when we combine them it should become A2B3
FOR E.G: AL2O3