Chemistry Formula for Atomic Structure Part 2

Chemistry Formulas for Atomic Structure

Chemistry Formulas from Bohr’s Model of Atom

·         Angular momentum of electron in nth orbit

Where, m = Mass of the electron,
            v = velocity of electron,
            r = radius of the orbit,
            h = Planck’s constant,
            n = no. of orbit in which electron is present,

·         Energy of electron in nth orbit

           Where, Z = Atomic No. of Electron,

·         Energy absorbed or released in an electron jump ( E)


·         Radius of orbits of hydrogen like species

         For hydrogen atom Z = 1, for first orbit n = 1,
         On substituting values of the constants
         h = 6.62×10-27erg sec,
         m = 9.1×10-28g,
         e = 4.8×10-10
     we get,
    r = 0.529 Å
So, radius of first orbit of hydrogen atom is 0.529 Å.

·         Radius of nth orbits of hydrogen like species

rn = 0.529n2/Z Å

·         Velocity of electron in nth orbit

      On substituting values of the constants
      We get,

·         No. of revolution per second made by an electron around the nucleus of atom

·         Energy of electron in nth orbit (En)

        On substituting values of the constants
        We get,          
         In general,

·         Energy of electron in a Hydrogen Atom in different energy levels

Energy Level
E (Joules/atom)
E (eV/atom)
E (kcal/mol)

·         Frequency or wave length of emitted radiation

            Where, λ = wavelength of emitted radiations
                        R = Rydberg constant for Hydrogen atom

·         Number of spectral lines produced when an electron drops from nth level to ground level


Chemistry Formulas from Photoelectric Effect

·         Planck’s Relationship,

E = hv

·         Total energy,

Total Energy = (mv2/2) + w
Where, w = energy required to remove the electron.

Chemistry Formulas from Wave Mechanical Concept of Atom

·         De Broglie’s Equation,

          Where, m = mass of particle,
                        v = velocity of the particle,
                        h = Planck’s Constant,

Chemistry Formulas from Heisenberg’s Uncertainty Principle

·        Heisenberg’s Uncertainty Principle,

           Where,   = uncertainty in the position of the particle,
                        = uncertainty in the momentum of the particle,

Chemistry Formulas from Quantum Numbers

·         Principle Quantum Number (n),

Maximum no. of electrons in n principle quantum number = 2n2

·         Azimuthal Quantum Number (l),

For the given value of principle quantum number (n), azimuthal quantum number (l), may have all integral values from 0 to (n-1)

·         Magnetic Quantum Number (m),

No. of orbitals in a sub-shell = 2 l+1

·         Spin Quantum Number (s),

For spinning of electron about its own axis

Related Posts

Latest Posts

Pharmaceutical Manufacturing Abbreviations

Abbreviations used in Pharmaceutical Manufacturing

Abbreviations used in Pharmaceutical Manufacturing As we know pharmaceutical manufacturing products i.e. medicines, life saving drugs have very high importance in our life. Today we learn about various abbreviations used in pharmaceutical manufacturing process steps or simply in pharmaceutical manufacturing companies.Read More…

Chemistry Tutor Chemistry Notes Info at new Web Address

Chemistry Notes Info _ Your Chemistry Tutor for Innovative Education

Welcome to new Chemistry Notes Info website Welcome Friends… Your chemistry tutor move from to This is just a welcome post especially from your Chemistry Tutor i.e. Chemistry Notes Info. Dear friends finally now we move our ChemistryNotesInfoRead More…

Leave a Reply to

%d bloggers like this: