If you found carbon 13 atom, you would know that

The Options are as follow,

a. it has 13 protons c. it has 13 neutrons

b. it has 13 electrons d. it has 7 neutrons

Answer:

Option-d is the correct answer.

Explanation:

As we know that C-13 has a atomic mass of 13. Also, atomic mass is given as,

Atomic Mass = # of Protons + # of Neutrons - - - (1)

Since;

Atomic Mass = 13

And,

# of protons = 6 (as number of protons = atomic number)

Putting values in equation 1,

13 = 6 - # of Neutrons

Solving for Number of Neutrons,

# of Neutrons = 13 - 6

# of Neutrons = 7