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Using the known values for hydrogen atom, calculate (a) radius of third orbit for Li^+2 (b) speed of electron in fourth orbit for He^+.

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Using the known values for hydrogen atom, calculate 

(a) radius of third orbit for Li+2

(b) speed of electron in fourth orbit for He+.

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1 Answer

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(a) z = 3 for Li+2. Further we know that rn = n2a0/z

substituting, n = 3, z = 3 and a0 = 0.529 Å

we have r3 for 

(b) z = 2 for He+. Also we know that

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