2h is a loosely bound isotope of hydrogen, called deuterium or heavy hydrogen. it is stable but relatively rare — it form only 0.015% of natural hydrogen. note that deuterium has z = n, which should tend to make it more tightly bound, but both are odd numbers.

2H consists of one proton and one neutron. The atomic mass of a proton is 1.00782u. The atomic mass of a neutron is equal to 1.00866u
Total mass=2.016u and mass of deuterium is equal to 2.01u
Mass difference= 0.002388u
BE = 0.002388×(3×108)²
=3.56912×10-13J
=2.230 Mev
=1.1153 Mev/nucleon

Green is technically every other color but green but the other wavelengths of the other colors get absorbed by the object and the wavelength of the color green gets reflected