What are the atomic number and mass number for the carbon isotope with seven neutrons?

The answer to your question is:

atomic number (Z) : 6

mass number (A) : 13

Explanation:

Carbon has an atomic number of 6 and a mass number of 12,

Mass number = # protons + # neutrons

12 = 6 + # neutrons

#neutrons = 12 - 6 = 6

For the carbon isotope the atomic number does not change is still 6

13 = 6 + # neutrons

# neutrons = 13 - 6

# neutrons = 7