Structure Of Atom

In the Bohr model of the hydrogen atom, the total energy of the electron is the sum of its kinetic energy and potential energy .
It can be shown that: Thus, the total energy is: This implies: But since , taking magnitude gives:

Isotopes are atoms of the same element that have the same number of protons (same atomic number) but different numbers of neutrons.
This leads to a different mass number.
Since chemical properties depend on the number of electrons and protons, isotopes behave similarly chemically but differ in mass and certain physical properties.