What is the correct order of electron gain enthalpy from least negative to most negative for the elements $\text{C, Ca, Al, F,}$ and $\text{O}$?

Electron gain enthalpy generally becomes more negative across a period (left to right) and less negative down a group.$\text{Ca}$ (Group 2): Has a stable $s^2$ configuration, very low tendency to gain an electron. Least negative.$\text{Al}$ (Group 13): Metal, less negative than non-metals.$\text{C}$ (Group 14): Non-metal.$\text{O}$ (Group 16): Highly electronegative.$\text{F}$ (Group 17): Halogen, needs only one electron to complete octet. Most negative.Order: $\text{Ca < Al < C < O < F}$.