4. (He] 2s^1 2p^4 is the correct electron configuration for:
a) C
b) O
c) Si
d) S

Hey there!

[He]2s²2p⁴ is the electron configuration for O (oxygen).

He is the noble has before oxygen. It has 2 electrons.

The s orbital is filled, and there are 4 electrons in the p orbital, so 6 elements over to the right.

This makes a total of 8 electrons.

Hope this helps!

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