The atomic mass of nitrogen is 14.00674 atomic mass units. Nitrogen is a gas that has the atomic number 7 and the chemical symbol N. There are 7 neutrons, 7 protons and 7 electrons in a nitrogen atom. read more
And my Periodic Table says that #N#, #Z=7#, has a mass of #14.01*g*mol^-1#. If you are having trouble with this, voice your concerns, and someone will help you. read more