Atomic Structure Questions

Frequency of the de-Broglie wave of electron in Bohr's first orbit of hydrogen atom is ______ × 1013 Hz (nearest integer). [Given : RH (Rydberg constant) = 2.18 × 10-18 J, h (Planck's constant) = 6.6 × 10-34 J.s.]

For hydrogen atom, energy of an electron in first excited state is −3.4 eV, K.E. of the same electron of hydrogen atom is x eV. Value of x is ______ × 10-1 eV. (Nearest integer) Answer

The energy of an electron in the first Bohr orbit of the H-atom is -13.6 eV. The magnitude of energy value of an electron in the first excited state of Be3+ is ______ eV (nearest integer value).

The surface of sodium metal is irradiated with radiation of wavelength x nm. The kinetic energy of ejected electrons is 2.8 × 10⁻-20 J. The work function of sodium is 2.3 eV. The value of x is ______ × 102 nm. (Nearest integer)(Given: h = 6.6 × 10⁻-3

Consider two radiations of wavelengths λ₁ = 2000 Å λ₂ = 6000 Å The ratio of the energies of these two radiations (E₁/E₂) is _____ (Nearest integer).

The uncertainty in the momentum of a particle is 2.5 × 10–16 g cm s–1. With what accuracy can its position be determined? (h = 6.625 × 10–27 erg. s, i.e., g cm2 s–1)

If an electron is present in n = 6 level. How many spectral lines would be observed in case of H atom

The ionization energy of H-atom is 13.6 eV. The ionization energy of Li+2 ion will be -

The ionization energy of He+ is 19.6 × 10–18 J atom–1. The energy of the first stationary state of Li+2 will be

What is potential energy of an electron present in N-shell of the Be3+ ion

Given below are two statements Statement I: Frequency of He⁺ ion of 2nd line of Balmer series is equal to that of 1st line of Paschen series of He⁺ ion. Statement II: Radius of 2nd Bohr orbit of He⁺ ion is equal to that of 2nd Bohr orbit of H atom. I

Which of the following statements are correct? (A) Work function (ϕ) is same for all metals. (B) Specific charge (e/m) of electron is greater than that of proton. (C) The electronic configuration of Cu is violating Aufbau principle (D) Bohr's model c

A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be : (h = 6.6×10–34 J s)

The energy of a photon is directly proportional to: I. wave number II. frequency III. wavelength Select the correct option.

The kinetic and potential energy (in eV) of electron present in third Bohr’s orbit of hydrogen atom are respectively;

Which orbital is non-directional?

The principle, which gives a way to fill the electrons in the available energy level is;

If the radius of the 3rd orbit of Li2+ ion is x, then find the radius of the 1st orbit of He+ ion in terms of x;

Match List I with List II List-I (Atomic models) A. Thomson Model B. Rutherford Model C. Bohr Model D. Quantum Mechanical Model List-II (Key features) I. Electrons embedded in a positive sphere II. Planetary model with a central dense nucleus III. Qu

Which of the following properties of atom could be explained correctly by Thomson model of atom?

Arrange the following orbitals of H-atom in the increasing order of their energy; 3px, 2s, 4dxy, 3s, 4pz, 3py, 4s

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: According to de-Broglie, the wavelengths associated with electrons and other subatomic particles can be detected experimentally. Reason

If an electron has spin quantum number of +1/2 and a magnetic quantum number of –1, then e– may not be present in;

Given below are two statements: Statement I: For a particular shell, maximum number of orbital is n² Statement II: For d-subshell, number of orientation lies between –l to +l including zero. In the light of the above statements, choose the most appro

If the value of (n + l) is more than 3 and less than 6, then what will be the possible number of orbitals?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Emitted radiations will fall in visible range when an electron jumps from higher energy level to n = 2 energy level in H-atom. Reason R:

Rutherford’s experiment, which established the nuclear model of an atom, used a beam of;

Which of the following sets of quantum number is(are) incorrect?

The radius of the second orbit of H-atom is equal to the radius of;

The orbital with maximum energy is;

Which of the following subshell can accommodate as many as 10 electrons?

Any f-orbital can accommodate upto;

The number of radial nodes of 3s, 3p and 3d orbitals are, respectively:

Select the correct statement(s); A. Heisenberg’s principle is applicable to stationary electron B. Paulis exclusion principle is not applicable to photons C. For an electron the product of velocity and principal quantum number will be independent to

For a given value of azimuthal quantum number l, the total number of values for the magnetic quantum number m are given by:

The number of orbitals associated with quantum number n = 5, ms = 1/2 is;

Given below are two statements: Statement I: A spectral line will be observed for a 2px → 2py transition. Statement II: 2px and 2py are degenerate orbitals. In the light of the above statements, choose the most appropriate answer from the options giv

In order to increase the kinetic energy of ejected photoelectrons, there should be an increase in;

Which one among the following statements is correct?

If the electron in a hydrogen atom drops from the n = 6 to the n = 4 level, the radiation emitted is in which series of lines in the spectrum of atomic hydrogen?

The ionization energy of H atom is 13.6 eV. The ionization energy of Li2+ ion will be;

The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be;

The velocity of particle A is 0.1 m/sec and that of particle B is 0.05 m/sec. If the mass of particle B is 5 times that of particle A, then the ratio of de-Broglie wavelength associated with particle A and B;

Uncertainty in position of a particle of 25 gram in space is 10–5 m. Hence uncertainty in velocity (m/sec) is (h = 6.6 × 10–34 J sec)

The total number of subshells in the nth energy level is;

In which of the following case would the probability of finding an electron residing in a dxy orbital be zero?

What is maximum number of electrons accommodated in a subshell having azimuthal quantum number, l = 2?

The increasing order of filling of electrons in the orbitals of an atom will be;

Given below are two statements: Statement I: Positive ions are formed from their neutral parent atom by the loss of electrons. Statement II: Cathode rays move from positive electrode to negative electrode. In the light of the above statements, choose

The orientation of an atomic orbital is governed by;