Are found in the nucleus.
Answer:

Explanation:
The valance of magnesium atom is
While the valence of nitrogen atom is 
Let us first write the first half-reactions

The second half reaction is

Adding the above two reactions and writing the final reaction, we get -

The balance equation is

Answer:
dry
Explanation:
it will dry the hydrogen chloride to the ammonia
Answer:
D
Explanation:
The scientist identifies the need to make a drug to cure the respiratory illnesses.