1.

The ratio between the first three orbits of hydrogen atom is………(a) 1:2:3 (b) 2:4:6(c) 1:4:9 (d) 1:3:5

Answer»

 (c) 1:4:9

En = \(\frac{-13.6 \times z^2}{n^2}\)

n = 1; E =- 13.6 eV/ atom 

n = 2; E = – 3.4 eV/ atom 

n = 3; E = -1.51 eV/atom     

The ratio of three orbits E1 : E2 : E3 = 13.6 : 3.4 : 1.51 = 1 : 4 : 9



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