I’m really confused on this singular question on an assignment for science. “Think about it. Which groups of elements are not included in the alien periodic table? Do you think it is likely that an alien planet would lack these elements? Explain.

I wanna hear from you guys for what I should put and if it’s wrong or right. It would be amazing if someone helped! Thanks

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation: