How do i know if the particles are monatomic or diatomic or tri-atomic or tetratomic

Explanation:

Monaotomic:- the elements that have only one atom in molecule are called monaotomic elements. they are stable. Example:-Ne,Ar all are noble gases

Diatomic:-the elements that have two atoms are called diatomic molecules. Example:- Oxygen

Triatomic:-the elments that have three atoms are called tri-atomic elements they are unstable. Ex.ozone

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explanation:

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.