For the reaction: 2 A + B2 --->> 2 AB Triangle H = -30.0 kJ a. The reaction is endothermic.

b. Heat is released to the surroundings.

c. The standard enthalpy of formation for AB is 30.0 kJ.

d. The bond energy for each A-B bond is 30.0 kJ.

Select the correct answer from each drop-down menu. to make a table of the elements, dmitri mendeleev sorted the elements according to their . he then split the list of elements into several columns so that elements beside each other had similar .