where n = 3, 4, 5, 6. As a result, these lines are known as the Balmer series. The Swedish physicist Johannes Rydberg (1854–1919) subsequently restated and expanded Balmer’s result in the Rydberg equation: 1λ=RH(1n2l−1n2h)(2.1.2.2)(2.1.2.2)1λ=RH(1nl2−1nh2) \dfrac{1}{\lambda }=R_H\; \left ( \dfrac{1}{n_l^{2}}-\dfrac{1}{n_h^{2}} \right ) \label{6.3.2} ,

The Haber-Bosch Process is catalyzed by an inorganic oxide catalyst and is one of the world's most important industrial reactions. It provides for the synthesis of ammonia directly from elemental nitrogen, N2, and hydrogen, H2. N2(g)+3H2(g)⇌2NH3(g)(1.3.1)