Question

Carbon-12 atom has :

• A. 6 electrons, 6 protons, and 6 neutrons
• B. 6 electrons, 12 protons, and 6 neutrons
• C. 12 electrons, 6 protons, and 6 neutrons
• D. 18 electrons, 6 protons, and 6 neutrons

Answer 1

The correct option is A 6 electrons, 6 protons, and 6 neutrons

The atomic number of $carbon-12$ is $12$. The atomic number of carbon is $6$. Therefore, the number of protons is $6$ and electrons are $6$ as the number of protons and electrons are the same in the neutral atom. The number of neutrons is equal to the difference of a mass number and atomic number, i.e., $12-6=6$.

So carbon-$12$ atom has $6$ electrons, $6$ protons, $6$ neutrons.

Hence, option $A$ is correct.