The enthalpy of formation of mx is δhf° = –525 kj/mol. the enthalpy of sublimation of m is δhsub = 139 kj/mol. the ionization energy of m is ie = 437 kj/mol. the electron affinity of x is δhea = –313 kj/mol. (refer to the hint). the bond energy of x2 is be = 227 kj/mol.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

you gotta add the following molecules so we can give u an answer

explanation: