STANDARD 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

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

An isotone of ⁷⁶₃₂Ge is

Which one is the wrong statement

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

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

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

In a given shell, the order of screening effect is

The correct order of increasing energy of atomic orbitals is

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

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

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?

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

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

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

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

Pauli’s exclusion principle states that

Orbital having 3 angular nodes and 3 total nodes is

Which of the following sets of quantum numbers is not possible for a 4p electron?

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

Assertion : The chemical properties of different isotopes are same. Reason : Isotopes have same number of neutrons.

The correct set of four quantum numbers for the valence electrons of rubidium atom (Z = 37) is:

Two electrons occupying the same orbital are distinguished by