Changes

To make one mole of CaCl₃, one can estimate that 1341 kJ of heat would be needed. This makes this compound completely non-viable. Why is so much heat needed to make CaCl3? It is because the third ionisation energy (the energy needed to remove the third electron) is extremely high (4940 kJ mol^-1) because the electron is being removed from the 3-level rather than the 4-level. Because it is much closer to the nucleus than the first two electrons removed, it is going to be held much more strongly.

To make one mole of CaCl₃, one can estimate that 1341 kJ of heat would be needed. This makes this compound completely non-viable. Why is so much heat needed to make CaCl3? It is because the third ionisation energy (the energy needed to remove the third electron) is extremely high (4940 kJ mol^-1) because the electron is being removed from the 3-level rather than the 4-level. Because it is much closer to the nucleus than the first two electrons removed, it is going to be held much more strongly.

   

   

A similar sort of argument applies to the negative ion. For example, [[oxygen]] forms an O^2- ion rather than an O^- ion or an O3- ion, because compounds containing the O^2- ion turn out to be the most energetically stable.

A similar sort of argument applies to the negative ion. For example, [[oxygen]] forms an O^2- ion rather than an O^- ion or an O^3- ion, because compounds containing the O^2- ion turn out to be the most energetically stable.

[[Category:Chemistry]]

[[Category:Chemistry]]