1.
Draw the Dot Structure for Na!

Na ·

Explanation:

Hello!

In this case, since the Lewis dot structure of any element illustrates the number of valence electrons at the outer shell; we can set up the electron configuration of sodium to obtain:

We can see there is only one valence electron, for that reason the Lewis dot structure is:

Na ·

Whereas the dot represents the valence electron.

Best regards!

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

all eukaryotic cell have mitochondria : )