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.  

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure

mammal

explanation: