Calculate the binding energy of the last neutron in the ⁴³₂₀Ca nucleus. Hint: You should compare the mass of ⁴³₂₀Ca with the mass of ⁴²₂₀Ca plus the mass of a neutron. The mass of ⁴²₂₀Ca=41.958622 u, whereas the mass of ⁴³₂₀Ca=42.958770 u.