What information would you have to know to determine the toughness of a solid?

What information is needed to determine the energy of an electron in a many-electron atom? What information is most important in determining the size of an orbital? Check all that apply. □m, my ms ms t information is needed to determine orientation of an orbital? What information is needed to determine the general shape of an orbital? ms

Consider the following reaction: HCl + NH_3 rightarrow NH_4Cl Calculate the AH at STP as written. Is this an exothermic or endothermic reaction? Can you tell if it is exergonic or endergonic? If not what information would you need to have to determine this?