Standard Books Chemistry Structure of Atom Class 11 Questions

The nucleus of helium contains

The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is

In the Geiger-Marsden scattering experiment, in case of head-on collision the impact parameter should be

An isotone of ⁷⁶₃₂Ge is

Two stable isotopes ⁶Li and ⁷Li have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u respectively. The atomic weight of lithium is

The graph of the total number of α-particles scattered at different angles in a given interval of time for α-particle scattering in the Geiger-Marsden experiment is given by

The volume occupied by an atom is greater than the volume of the nucleus by a factor of about

The natural boron of atomic weight 10.81 is found to have two isotopes ¹⁰B and ¹¹B. The ratio of abundance of isotopes of natural boron should be

Which one is the wrong statement

Which of the following spectral series falls within the visible range of electromagnetic radiation?

The radius of first Bohr's orbit for hydrogen is 0.53 Å. The radius of third Bohr's orbit would be

The shortest wavelength present in the Paschen series of spectral lines is (R = 1.097 × 10⁷ m⁻¹)

The relation between the orbital radius and the electron velocity for a dynamically stable orbit in a hydrogen atom is (where, all notations have their usual meanings)

In Balmer series of emission spectrum of hydrogen, first four lines with different wavelength Hα, Hβ, Hγ and Hδ are obtained. Which line has maximum frequency out of these?

The wavelength of radiation emitted is λ₀ when an electron jumps from the third to second orbit of hydrogen atom. For the electron jumping from the fourth to the second orbit of the hydrogen atom, the wavelength of radiation emitted will be

The magnetic moment of a divalent ion in aqueous solution with atomic number 25 is

The shortest wavelength in the Balmer series is (R = 1.097 × 10⁷ m⁻¹)

The statements (i) In filling a group of orbitals of equal energy, it is energetically preferable to assign electrons to empty orbitals rather than pair them into a particular orbital. (ii) When two electrons are placed in two different orbitals, energy is lower if the spins are parallel. are valid for

According to Bohr's theory, the wave number of last line of Balmer series is (R = 1.1 × 10⁷ m⁻¹)

The first line of the Lyman series in a hydrogen spectrum has a wavelength of 1210 Å. The corresponding line of a hydrogen-like atom of Z = 11 is equal to

For azimuthal quantum number l = 3, the maximum number of electrons will be Maximum number of electrons in a subshell with l = 3 and n = 4 is

If an electron has spin quantum number of 1/2 and a magnetic quantum number of −1, it cannot be presented in an

What is the ratio of the shortest wavelength of the Balmer series to the shortest wavelength of the Lyman series?

If the wavelength of the first line of the Balmer series of hydrogen is 6561 Å, the wavelength of the second line of the series should be

If v₁ is the frequency of the series limit of Lyman series, v₂ is the frequency of the first line of Lyman series and v₃ is the frequency of the series limit of the Balmer series, then

Match the correct pairs.

In a given shell, the order of screening effect is

The angular speed of the electron in the nᵗʰ orbit of Bohr's hydrogen atom is

The correct order of increasing energy of atomic orbitals is

The electric current I created by the electron in the ground state of H atom using Bohr model in terms of Bohr radius (a₀) and velocity of electron in first orbit v₀ is

Which of the following statements is true for hydrogen atom?

What is the lowest value of n that allows g orbital to exist?

The radius of nᵗʰ orbit rₙ in terms of Bohr radius (a₀) for a hydrogen atom is given by the relation

Observe the given boundary surface diagrams of two orbitals I and II and choose the correct option.

In a hydrogen atom the total energy of electron is

In the Bohr model of the hydrogen atom, the lowest orbit corresponds to

The number of radial nodes and angular nodes ion for d-orbital can be represented as

The value of ionisation energy of the hydrogen atom is

How many orbitals in total are associated with 4th energy level?

If n is the orbit number of the electron in a hydrogen atom, the correct statement among the following is

Which of the following is not correct about Bohr model of the hydrogen atom?

The number of radial nodes for 3p orbital is _______.

In which of the following systems will the radius of the first orbit (n = 1) be minimum?

In which of the following Bohr's orbit (n) a hydrogen atom emits the photons of lowest frequency?

For the electrons of oxygen atom, which of the following statements is correct?

The transition from the state n = 3 to n = 1 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

If E is the energy of nᵗʰ orbit of hydrogen atom the energy of nᵗʰ orbit of He atom will be

The energy required to excite an electron in hydrogen atom to its first excited state is

If n = 2 for He⁺ ion then find out the wavelength.

A triply ionized beryllium Be³⁺ has the same orbital radius as the ground state of hydrogen. Then the quantum state n of Be³⁺ is