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a) Answer is: Li-F, Na-F, K-F, Rb-F, Cs-F.

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

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.

For example fluorine has electronegativity approximately χ = 4 and sodium χ = 0.95, fluorine attracts electron and it has negative charge and sodium has positive charge.

Δχ(Li-F) = 4 - 1 = 3.

Δχ(Na-F) = 4 - 0.95 = 3.05; electronegativity difference between sodium and fluorine.

Δχ(K-F) = 4 - 0.85 = 3.15.

Δχ(Rb-F) = 4 - 0.8 = 3.2.

Δχ(Cs-F) = 4 - 0.75 = 3.25.

b) Answer is: P-S, N-F, Al-N, Mg-O, K-Cl.

Δχ(Mg-O) = 3.5 - 1.3 = 2.2; electronegativity difference between magnesium and oxygen.

Δχ(P-S) = 2.6 - 2.2 = 0.4; electronegativity difference between phosphorus and sulfur.

Δχ(N-F) = 4 - 3 = 1; electronegativity difference between nitrogen and fluorine.

Δχ(K-Cl) = 3.2 - 0.85 = 2.35; electronegativity difference between potassium and chlorine.

Δχ(Al-N) = 3 - 1.6 = 1.4; electronegativity difference between aluminium and nitrogen.

pstnonsonjoku

The trend in increasing bond polarity is;

  • Li-F < Na-F <  K-F <  Rb-F < Cs-F
  • P-S  < N-F < Al-N < Mg-O < K-Cl

What is polarity?

The term polarity is used to describe the unsymmetrical distribution of electron density in a bond due to a difference in electronegativity between the atoms in the bond.

The trend in increasing bond polarity is;
  • Li-F < Na-F <  K-F <  Rb-F < Cs-F
  • P-S  < N-F < Al-N < Mg-O < K-Cl

Learn more about polarity: https://brainly.com/question/4083236?

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