Question

which of these make the best conductors of electricity?
ionic bonding
metallic bonding
covalent bonding
polar covalent

1. choose the best answer.

two elements have an electronegativity difference of 1.3.
what type of bond will form between them?
polar covalent
nonpolar covalent
ionic

Explanation:

• For the first question: Metallic bonding has delocalized electrons that can move freely, allowing for good electrical conductivity. Ionic bonding (conductive when molten/solution), covalent bonding (poor conductors as electrons are shared not free), and polar covalent (similar to covalent in conductivity context) are not as good as metallic for general electrical conduction.
• For the second question: A general rule is that if the electronegativity difference ($\Delta EN$) is between \(0.5\leq\Delta EN < 1.7\), the bond is polar covalent. Here \(\Delta EN = 1.3\) which falls in this range. Non - polar covalent has \(\Delta EN<0.5\) and ionic has \(\Delta EN\geq1.7\).

Answer:

1. metallic bonding
2. polar covalent