Endothermic Process of Forming a Cation

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The discussion centers on the endothermic nature of cation formation, specifically addressing why energy is absorbed when a potassium atom loses an electron to form a potassium cation. It highlights that a potassium cation is smaller than the neutral potassium atom, which may suggest that heat is released; however, this is not the case. The key point is that the size change of the atom does not correlate with the heat of the reaction. Ionization energy, defined as the energy required to remove an electron from an atom, is emphasized as the reason energy must be supplied for ionization to occur. The conversation reinforces that ionization is an endothermic process, requiring energy input rather than releasing heat.
alijan kk
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why formation of a cation an endothermic process, a potassium cation is smaller than potassium atom , doesn't that mea that heat is released ? lower energy atom(cation)

is that the reason that we put energy to ionize the atom? (heat absorbed endo thermic)
 
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Size change has no correlation with the reaction heat.

Do you know what ionization energy is?
 
Borek said:
Size change has no correlation with the reaction heat.

Do you know what ionization energy is?
the energy we put to pull of the electron ,
 
And why is that ionization requires energy?
 

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