Atoms and Atomic Spectra Final

Question 1

Rydberg Formula

Answer 1

1/λ = RZ^2 (1/m^2 - 1/n^2)

Question 2

Bohr Radius Derivation

Answer 2

• Angular Momentum is quantised
• nh/2π = mvr
• Centripetal Force = Electrostatic Force
• Substitude v and you get bohr radius

Question 3

Bohr Radius Equation

Answer 3

• r = n^2 a
• a = ϵh^2 / πme^2

Question 4

Summary

Answer 4

• Electrons have well defined energy levels
• Electrons can only orbit at specific radii
• Electrons can only gain/lose energy by EM radiation/absorption where ΔE=hf