Question

What is the mass number of a carbon atom with 6 protons and 6 neutrons? 6 12 24 18

Answer 1

12

Step-by-step explanation:

A neutral atom of Carbon-12 contains six protons, six neutrons, and six electrons; therefore, it has a mass number of 12

Answer 2

12

Step-by-step explanation:

Mass number = #protons + #neutrons = 6 + 6 = 12