1. Mg ₂ X ₃ 2. Mg ₂ X 3. MgX ₂ 4. Mg ₃ X ₂

Answer: 4. Mg ₃ X ₂ X has configuration 1s²2s²2p³ , so it is nitrogen and forms mathrmX³⁻ . Magnesium forms mathrmMg²⁺ . Balancing charges: 3×(+2)=+6 and 2×(-3)=-6 , so the formula is Mg₃X₂ (option 4).

Topic: Kossel-Lewis approach, ionic and covalent bonds· Chemical Bonding and Molecular Structure

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s^2 2s^2 2p^3, the simplest formula for this compound is

1. Mg\(_2\)X\(_3\)

2. Mg\(_2\)X

3. MgX\(_2\)

4. Mg\(_3\)X\(_2\)

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Answer: 4. Mg\(_3\)X\(_2\)

X has configuration \(1s^22s^22p^3\), so it is nitrogen and forms \(\mathrm{X^{3-}}\). Magnesium forms \(\mathrm{Mg^{2+}}\).

Balancing charges: \(3\times(+2)=+6\) and \(2\times(-3)=-6\), so the formula is \(\mathrm{Mg_3X_2}\) (option 4).

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Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s^2 2s^2 2p^3, the simplest formula for this compound is

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