Answer
Monatomic molecules behave like point masses so they can have only translational kinetic energy. Moreover, in addition to translational kinetic energy, diatomic molecules can have rotational and vibrational kinetic energy since this type of molecule can rotate and the atoms may also vibrate.
Work Step by Step
Monatomic molecules behave like point masses so they can have only translational kinetic energy. Moreover, in addition to translational kinetic energy, diatomic molecules can have rotational and vibrational kinetic energy since this type of molecule can rotate and the atoms may also vibrate.