Question

The energy of 1^st orbit in a hydrogen atom __________

(a) 3.18×10^–12 J

(b) –2.18×10^–18 J

(c) –3.18×10^–18 J

(d) 2.18×10^–18 J

I have been asked this question during an online exam.

I'm obligated to ask this question of Bohr’s Model for Hydrogen Atom topic in portion Structure of Atom of Chemistry – Class 11

Answer 1

Correct choice is (b) –2.18×10^–18 J

Explanation: The energy of an nth orbit in a hydrogen atom is given by the formula En = -RH/n^2, where is the energy of nth orbit and RH is the Rydberg constant. The energy of 1^st orbit in a hydrogen atom = -2.18 x 10^-18 J/1 = -2.18 x 10^-18 J.