An element with an atomic number of 6 corresponds to carbon (C) on the periodic table. The atomic number of an element represents the number of protons in its nucleus, which in this case is 6.
In a neutral atom, the number of electrons is equal to the number of protons. Therefore, a carbon atom with an atomic number of 6 will also have 6 electrons.
However, you mentioned a mass number of 10. The mass number is the sum of protons and neutrons in the nucleus of an atom. Carbon-10 (C-10) is an isotope of carbon with 6 protons and 4 neutrons. While the number of protons remains the same (6), the number of neutrons changes the mass number. Nevertheless, the number of electrons in an atom is primarily determined by the atomic number, which remains 6 in this case.