± What Holds Matter Together? Part D The ionization energy of an atom is the ene

Question

± What Holds Matter Together?

Part D

The ionization energy of an atom is the energy required to remove an electron from that atom. The electron affinity of an atom is the energy released when an electron is added to that atom. These numbers are important for finding the bond energy of ionic bonds. In an ionic bond an electron is removed from one atom and given to the other. Therefore, the net contribution to bond energy from moving the electron is as follows:

(electron affinity of negative ion)(ionization energy of positive ion).

Find the total bond energy, including the electrostatic contribution, for the bond in a KCl molecule. The ionization energy of K is 4.34 eV, and the electron affinity of Cl is 3.62 eV.

Express your answer in electron volts to three significant figures.

Explanation / Answer

chemical forces holds matter together . that means it may be ionic , covalent , or some other forces

electrostatic contribution = 5.39 eV . it may be calculated in your part C .

now attraction energy = IE - EA

                                    = 4.34 - 3.62

                                    = 0.72 eV

total bonding energy = 5.39 - 0.72

                                   = 4.67 eV ----------------------> answer

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