Question

Carbon-12 atom has:
(A) $ 6 $ electrons, $ 6 $ protons, $ 6 $ neutrons.
(B) $ 6 $ electrons, $ 12 $ protons, $ 6 $ neutrons.
(C) $ 12 $ electrons, $ 6 $ protons, $ 6 $ neutrons.
(D) $ 18 $ electrons, $ 6 $ protons, $ 6 $ neutrons.

Answer 1

Hint :We know that it is important to know the basic terms such as atomic number, mass number, neutrons, protons, electrons etc. Mass number is the sum of protons and neutrons present in the nucleus of the atom. Protons and neutrons are collectively known as nucleons.

Complete Step By Step Answer:
Electrons, protons and neutrons are the subatomic particles. Electrons are the subatomic particle which carries a negative charge, while protons are the subatomic particle with a positive charge and neutrons are the subatomic particle which has no charge. Protons and neutrons both are present in the nucleus of the atom whereas electrons revolve around the nucleus. Atomic number is the number of protons present in the nucleus of every atom of that element. In the lower classes of chemistry, we are familiar with the concepts of atoms, its structure, composition and also the properties about it from the basic concepts of chemistry which we studied in the chapters of chemistry.
The electrons that are negatively charged species that revolve around the orbit of the nucleus in the circular path. The atomic number of any atom indicates the number of protons present in their nucleus and also from the facts it is known that the number of protons is always equal to the number of electrons and therefore they are equal. Neutrons and protons together are concentrated in the nucleus which gives the mass number to that particular element.
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. $ The number of neutrons is equal to difference of atomic mass and atomic number, i.e. $ 6. $ So $ carbon-12 $ atoms have $ 6 $ electrons, $ 6 $ protons, $ 6 $ neutrons.
Therefore, the correct answer is option A.

Note :
Remember that an atom and what its constituent parts are. An atom is the smallest particle that can exist which builds the entire universe and each atom. It is composed of a central nucleus in which positively charged species called protons and the neutral species called neutrons are situated.