Mass of 7 protons and 7 neutrons=\\\\(7(1.007825+1.008665)=14.11543amu\\\\)Mass of \\\\(_7^{14}N=14.008amu\\\\)Hence mass lost as energy in formation of nitrogen atom=\\\\(0.10743amu\\\\)Mass of 8 protons and 8 neutrons=\\\\(8(1.007825+1.008665)amu=16.13192amu\\\\)Mass of \\\\(_8^{16}O=16.000amu\\\\)Hence mass lost as energy in formation of oxygen atom=\\\\(0.13192amu\\\\)Since more mass has been lost in formation of oxygen atom, oxygen atom is more stable.