Which level of the single ionized carbon has the same energy as the ground state energy of hydrogen atom?

a. 8

b. 1

c. 6

d. 4

Answer: (c)

En = –13.6(Z2/n2)(energy in nth state for hydrogen-like atom)

Enth of Carbon = E1st of Hydrogen

–13.6× (62/n2) = –13.6 × (12/12)

n = 6

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