Question

The molecule hydrogen fluoride (HF) contains a polar bond H – F, where fluorine is more electronegative than hydrogen. Which is the appropriate representation of the H – F bond? -H − F+ +H − F– δ-H − Fδ+ δ+H − Fδ-

Answer 1

The answer is: δ+H − Fδ-.

Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.  

Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.  

In this example, fluorine (F) has electronegativity approximately χ = 4 and hydrogen (H) has χ = 0.95, fluorine attracts electron and it has negative charge and hydrogen has positive charge.  

When the electronegativity difference is greater, the bond polarity is increasing.  

Hydrogen and fluorine form polar covalent bond.

Answer 2

The answer is going to be +H-F. Hope that helps you at all