A nucleus of carbon-14 (614C^{14}_{6}\text{C}614C) undergoes β−\beta^-β− decay to form a nitrogen-14 (714N^{14}_{7}\text{N}714N) nucleus.
Which of the following correctly describes the change in the neutron number of the nucleus, and the ratio of the specific charge of the nitrogen-14 nucleus to the specific charge of the carbon-14 nucleus?
Assume the mass of a nucleon is u u\,u and neglect the nuclear mass defect.
Change in neutron number = −1-1−1 ; Ratio of specific charges = 67\frac{6}{7}76
Change in neutron number = +1+1+1 ; Ratio of specific charges = 67\frac{6}{7}76
Change in neutron number = −1-1−1 ; Ratio of specific charges = 76\frac{7}{6}67
Change in neutron number = +1+1+1 ; Ratio of specific charges = 76\frac{7}{6}67