Evolution of the mass fraction in the N₂ reservoirs atmosphere, mantle and core for different values of the metal-silicate partition coefficient D_N in our Earth analogue. We set here the total nitrogen mass to an arbitrary value of 3.8 × 10¹⁸ kg, similar to the modern terrestrial atmosphere reservoir. Since N₂ in our model does not affect the thermodynamics or mass of the planet, this choice is arbitrary. We show the results for three values of the metal-silicate partition coefficient, D_N = 1,10,100. However, the partitioning between core and mantle has to compete also with the outgassing of N₂ to the atmosphere. This means that even D_N = 100 leads only to approximately equal masses of nitrogen in the atmosphere and in the core. Hence it is hard to store significant amounts of N in the core of Earth.