List the rules for Ionic and Covalent compounds

i think slash and

i don't know people like to fight everywhere rip.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms