Which of the following postulate of Bohr’s model of hydrogen atom is not in agreement with quantum mechanical model of an atom? [2025]

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Q.
Which of the following postulate of Bohr’s model of hydrogen atom is not in agreement with quantum mechanical model of an atom [2025]

1 An atom in a stationary state does not emit electromagnetic radiation as long as it stays in the same state.

2 An atom can take only certain distinct energies $E_{1}, E_{2}, E_{3},$ etc. These allowed states of constant energy are called the stationary states of atom.

3 When an electron makes a transition from a higher energy stationary state to a lower energy stationary state, then it emits a photon of light.

4 The electron in a H atom’s stationary state moves in a circle around the nucleus.

Ans.
(4)

According to quantum mechanical model of an atom, position of an electron is not certain. We can only talk about the probability of finding an electron around a nucleus. The region of space where probability of finding an electron is 90–95% is an orbital.

Solution

Q.
Which of the following postulate of Bohr’s model of hydrogen atom is not in agreement with quantum mechanical model of an atom [2025]

1 An atom in a stationary state does not emit electromagnetic radiation as long as it stays in the same state.

2 An atom can take only certain distinct energies $E_{1}, E_{2}, E_{3},$ etc. These allowed states of constant energy are called the stationary states of atom.

3 When an electron makes a transition from a higher energy stationary state to a lower energy stationary state, then it emits a photon of light.

4 The electron in a H atom’s stationary state moves in a circle around the nucleus.

Ans.
(4)

According to quantum mechanical model of an atom, position of an electron is not certain. We can only talk about the probability of finding an electron around a nucleus. The region of space where probability of finding an electron is 90–95% is an orbital.

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Solution

Q. Which of the following postulate of Bohr’s model of hydrogen atom is not in agreement with quantum mechanical model of an atom [2025]

1 An atom in a stationary state does not emit electromagnetic radiation as long as it stays in the same state.

2 An atom can take only certain distinct energies E1,E2,E3, etc. These allowed states of constant energy are called the stationary states of atom.

3 When an electron makes a transition from a higher energy stationary state to a lower energy stationary state, then it emits a photon of light.

4 The electron in a H atom’s stationary state moves in a circle around the nucleus.

Ans. (4) According to quantum mechanical model of an atom, position of an electron is not certain. We can only talk about the probability of finding an electron around a nucleus. The region of space where probability of finding an electron is 90–95% is an orbital.

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Q.
Which of the following postulate of Bohr’s model of hydrogen atom is not in agreement with quantum mechanical model of an atom [2025]

2 An atom can take only certain distinct energies $E_{1}, E_{2}, E_{3},$ etc. These allowed states of constant energy are called the stationary states of atom.

Ans.
(4)

According to quantum mechanical model of an atom, position of an electron is not certain. We can only talk about the probability of finding an electron around a nucleus. The region of space where probability of finding an electron is 90–95% is an orbital.