Chemistry

Question Analysis
This question involves bond polarity and electronegativity. The main focus is on comparing the ionic character of two covalent bonds by analyzing electronegativity differences.

Key Concept Explanation
Pure covalent bonds (nonpolar) have no ionic character. Polar covalent bonds have a certain degree of ionic character, and the larger the electronegativity difference between the two bonded atoms, the more uneven the electron sharing, and the greater the ionic character of the bond.

Step-by-step Solution
1. Identify the state of the ionic compound: solid MgO and molten MgO.1. Recall the core rule: The ionic character of a polar covalent bond is positively correlated with the electronegativity difference between bonded atoms.
2. Calculate the electronegativity difference: