Define the different terms used for the composition of a nucleus.

(N/A) The composition of a nucleus is described by the following terms:
$1$. Nucleon $(A)$: The total number of protons and neutrons present in the nucleus of an atom.
$2$. Atomic Number $(Z)$: The number of protons in the nucleus of an atom,which is equal to the number of electrons in a neutral atom.
$3$. Mass Number $(A)$: The total number of protons and neutrons in the nucleus,given by $A = Z + N$.
$4$. Neutron Number $(N)$: The number of neutrons present in the nucleus of an atom,calculated as $N = A - Z$.
$5$. Nuclide: $A$ specific type of nucleus characterized by its atomic number and mass number,represented by the symbol ${ }_{Z}^{A}X$,where $X$ is the chemical symbol of the element.
For example,the nuclide of gold is ${ }_{79}^{197}Au$,which contains $197$ nucleons,$79$ protons,and $118$ neutrons.