The name of the compound K3N is potassium nitride (C).
The answer is A. As the first statement is a true statement. Hope this help you
I pretty sure the answer is a
Answer: a) 
b) 
c) 
d) 
e) 
Explanation:
A balanced nuclear equation is one in which the atomic number and mass number remains same on both sides of the equation i.e the number of protons and neutrons remain same.
General representation of an element is given as:
Z represents Atomic number
A represents Mass number
X represents the symbol of an element
a) 
b) 
c) 
d) 
e) 