There are 18 Elements in the fifth period.
Answer:

Explanation:
Nitrogen has the atomic number = 7
So, No. of electrons = 7
<u><em>Electronic Configuration:</em></u>

<u>Remember that:</u>
s sub shell holds upto 2 electrons while p sub shell upto 6
Answer:
2.567 litres
Explanation:
I dont have a proper explanation sorry
A. <span>the layer of rock and mineral fragments that covers nearly all of Earth's land surface</span>