It depends on the number of valence electrons required to make octet or duplet( in case of H)
. For example, Nitrogen(atomic number = 7) has electronic configuration(2,5) which means nitrogen has 5 valence electrons and requires 3 more electrons to complete its octet. After gaining 3 electrons from atoms of an element with less electronegativity than N, it forms nitride ion (
). 
Hope this helps.
 
        
        
        
I legitimately think it's 87.3 grams
 
        
             
        
        
        
Answer: Balanced equation that is formed by combining these two half reactions is  .
.
Explanation:
A chemical equation which contains same number of atoms on both reactant and product side is called a balanced chemical equation.
For example, 

On cancelling the common species from both these half-reactions, the complete balanced equation will be as follows.
 
 
Thus, we can conclude that balanced equation that is formed by combining these two half reactions is  .
.
 
        
             
        
        
        
Answer:i dont know the answer