1s^2 2s^2 2p^6 3s^2 3p^6 how many unpaired electrons are in the atom represented by the electron configuration above?

0 unpaired

Explanation:

the electron configuration of 1s^2 2s^2 2p^6 3s^2 3p^6, can also be written in noble gas configuration as [Ne] 3s^2 3p^6 which translates to the element Argon ( Ar ). Since the outer shell is full with 8 valence electrons, there is no lone electron so all elections are paired.

yes it is balanced

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