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

• A. Atomic number 6, mass number 13
• B. Atomic number 6, mass number 12
• C. Atomic number 7, mass number 13
• D. Atomic number 7, mass number 14

Answer: (A)

Verified step by step guidance

1. Understand the concept of isotopes: Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.
2. Identify the atomic number: The atomic number is the number of protons in an atom. For carbon, the atomic number is 6, which means it has 6 protons.
3. Determine the number of neutrons: The problem states that the carbon isotope has seven neutrons.
4. Calculate the mass number: The mass number is the sum of protons and neutrons in the nucleus. Use the formula: $\mathrm{Mass} \mathrm{number}=\mathrm{Atomic} \mathrm{number}+\mathrm{Number} \mathrm{of} \mathrm{neutrons}$
5. Substitute the values: Substitute the atomic number (6) and the number of neutrons (7) into the formula to find the mass number.