You have discovered a new element called element X. Element X has two isotopes. X-50 has a percent abundance of 80%. X-56 has an abundance of 20%. What is the atomic mass of element x?

indium, and thallium have three electrons i think

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.