Answer: The mass number is 13
Explanation:
Mass number = Protrons + neutrons;
While Atomic number = Number of neutrons
Therefore, if the atomic number of nitrogen is given as 7, then its Protrons = 7
So, mass number = 7 + 6 = 13
I believe it was just called "the rule of law"
It is practically continuous, our blood is constantly circulating around our body passing through so many veins and arteries multiple times