Answer :
endothermic process, endothermic process
Both the removal of an electron from sodium and the removal of an electron from fluorine are endothermic processes. Ionization enthalpies are always positive because removing an electron from an atom always requires energy. It is always an endothermic process.
Endothermic processes:
Heat transfer from the environment to the systems is an endothermic process. As a result, the system has absorbed heat from the environment. An endothermic process has a positive delta H change in enthalpy. Ice cube melting is one instance.
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