Question

What is the chemical formula of the compound formed when ${}_{11}^{23}\text{X}$ combines with ${}_9^{19}\text{Y}$?

• A. XY
• B. $X_{2}Y$
• C. $X{Y}_2$
• D. $X_2{Y}_3$

Answer 1

The correct option is A XY

As we can see that,
X have atomic no 11 so it have 1 valence electron and it will form $X^{+}$
Similarly Y have 7 valence electron so it will form $Y^{-}$.
So they will form $XY$ compound.