"If the average number of nucleons per atoms is A, the number density of atoms for the gas in its neutral state is n=p/(Am_p), and the mean molecular mass is A. If the number if protons and neutrons in each nucleus is roughly equal then A/2 electrons will be liberated from each atom when the gas is full ionized. The number density of the gas will then be n p/(2m_p) assuming A/2 >> 1, and its mean molecular mass will be 2." Explain how the condition A/2 >> 1, implies 2.