How many atoms are in the outer-most shell in order for it to be stable?

8 Electrons

Explanation:

Got it from siri lol :) Have a good day.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.