Briefly explain the difference between an isotope and two species that are isoelectronic provide an example for an isotope and isoelectronic species to argon-40

Explanation:

Isotope are the species which have same atomic number (number of the protons) but number of neutrons different. which corresponds to different mass of isotopes.

For example,

are the three isotopes of carbon.

Isoelectronic are the species which have the same number of electrons.

For example,

Ne is isoelectronic with

Isotopes of are:

The number of the electrons in = 18

Number of the electrons in = 18

Thus, is isoelectronic to Argon-40