Answer:
The diatomic molecules in the preceding list can move in translation, vibration, and rotation. A monoatomic gas can only move translationally. Heat is required to increase translational, rotational, and vibrational energy of a mole of diatomic gas by 1°C. These gases have greater specific temperatures than monoatomic gases.
Chlorine has higher specific heat than the others because it has vibrational motion as well as rotational and translational motions.