Question

why atmosphere is bad conducter of heat?
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Answer 1

Air is a bad conductor of heat because it's molecules are not in continuous contact with each other. Air molecules are too far to disperse heat energy to one another efficiently. Heat is conducted by molecules and atoms that are very closely bonded together and vibrating at high frequency.

Answer 2

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In short, due to the lack of bonds in gases so that gases can't hold atoms together and let them move freely, unlike solids which have strong lattice structure of molecular bonds. Hence, such scattering atoms have poor thermal conductivity