Question

How do you write electron affinity in equation?

F(g) + e- ——> F-(g) -328 kJ/mol
Or
F(g) + e- ——> F-(g) +328 kJ/mol

Answer 1

The correct electron affinity equation for fluorine is F(g) + e- → F-(g) + 328 kJ/mol, signifying the release of energy during the formation of a fluoride ion. The positive sign reflects an exothermic reaction.

Step-by-step explanation:

The correct way to write the electron affinity equation for fluorine is:

F(g) + e- → F-(g) + 328 kJ/mol

This indicates that energy is released when a neutral fluorine atom in the gaseous state gains an electron to become a fluoride anion. The process is exothermic, therefore the energy change associated with the electron affinity (EA) is expressed as a positive number. Remember, the more negative the EA value, the more energy is released upon gaining an electron, which is indicative of a high affinity for electrons.

Elements across the periodic table generally increase in electron affinity from left to right, and decrease from top to bottom. However, electron affinity can vary and does not always follow a straightforward trend due to other factors like electron configurations and subshell completions.