The stability of a nucleus depends on the
question 1 options:
a)atomic number
b)atomic mass
c)number of neutrons
d)proton-neutron ratio

The stability of a nucleus depends on the proton-neutron ratio.

Proton-neutron ratio

Explanation:

The stability of the nucleus is dependent on the protons to neutrons ratio. However, the ratio of neutrons to protons determines the stability of the nucleus of the isotopes of an atom.

If the nucleus of the atom is unstable then it converts itself to a lower energy state or another isotope and yields energy to become stable. If this process occurs in radioactive isotope then it is known as transmutation.  

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