Carbon atom belong to the group 4 due to the presence of 4 electrons in the outermost shell. There are 6 proton, 6 electron and six neutron are present inside carbon atom. 2 electrons are present in the first shell and 4 electrons are present in the second shell. Atomic number of carbon atom is 6 while mass number of carbon atom is 12. Carbon has three isotopes i. e. C-12, C-13 and C-14. Isotopes are those substances which have same atomic number but different mass number.
