common factor
All numbers have factors. Some numbers have some of the same factors as other numbers. These are common factors.
Two atoms with the same number of protons but different numbers of neutrons are called "isotopes".
Atoms of the same element cannot have different numbers of protons. Different numbers of protons mean different elements. An atom with the a different number of neutrons is called an isotope.
common factor
Isotopes
It is a sequence of numbers which is called an arithmetic, or linear, sequence.
If you mean can be read the same back to front as front to back such as 12321 or 75257 its a palindrome.
If they have the same atomic number but different mass, then they have a different number of neutrons, and they are called ISOTOPES.
They are called common factors when they are the same for two or more numbers. They are factors that are common to both number.
On average, in any atom, you will have the same number of electrons and protons.
They are called as isotopes in which mass number differ by emmision of radiation
They are isotopes of that element, they have different neutron numbers.