Explain the important distinctions between each pair of terms: 

(a) Frequency and wavelength; 

(b) Ultraviolet and infrared light; 

(c) Continuous and discontinuous spectra; 

(d) Traveling and standing waves;

(e) Quantum number and orbital; 

(f) Spdƒ notation and orbital diagram; 

(g) S block and p block; 

(h) Main group and transition element; (i) the ground state and excited state of a hydrogen atom.