An atom of element has a 14 protons. what would the element's atomic number be?

14.

The atomic number directly correlates with the amount of protons an element has. This also goes for electrons within an element. Therefore, since the element has 14 protons, the atomic number would also be 14.

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

10 years is the answer