Define: Atomic Mass, Mass Number, Isotope

Explanation:

the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

the total number of protons and neutrons in a nucleus.

to write the symbol for an isotope, place the atomic number as a subscript and the mass number (protons plus neutrons) as a superscript to the left of the atomic symbol

Bubble sort

Explanation:

Bubble Sort is generally considered impractical for real-world use and is almost exclusively used only in the academic setting.

Bubble sort is often characterized by its iteration method, whereby it steps through a list repeatedly by performing the comparison and swapping near elements if the second element when is wrongfully positioned.

It is considered as a form of simple algorithm and sometimes referred to as sinking sort.

In reality, algorithm including the likes of quicksort, import, or merge sort is deemed efficient.