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.  

synapse nervous system

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )