List of top Chemistry Questions on Atomic Models

The energy of an electron in the second orbit of a hydrogen atom is $ -3.4 \, \text{eV} $. What is the energy of the electron in the third orbit? (Given: Energy of an electron in the $ n $-th orbit of hydrogen is $ E_n = -\frac{13.6}{n^2} \, \text{eV} $).

The energy of the nth orbit of the hydrogen atom is given by: \[ E_n = - \frac{13.6}{n^2} \, \text{eV} \] What is the energy of the second orbit (n = 2) of the hydrogen atom?

One mole of an ideal gas expands from 10 dm$^3$ to 20 dm$^3$ through an isothermal reversible process. Find $ \Delta U $, $ q $, and $ w $.

Incorrect order of atomic radius is?

Dalton’s Atomic Theory could not explain which of the following?

Which of the following is the correct electronic configuration of $ \mathrm{Cr} $ (Chromium, atomic number 24)?

Choose the Incorrect Statement about Dalton's Atomic Theory

Magnetic moment due to the motion of the electron in n^th orbit of Bohr atom is proportional to n^x. The value of x is

The number of s-electrons present in an ion with 55 protons in its unipositive state is

Electrons in a cathode ray tube have been emitted with a velocity of $1000\, m s ^{-1}$. The number of following statements which is/are true about the emitted radiation is _______ Given : $h =6 \times 10^{-34} J s , m _e=9 \times 10^{-31} kg$
(A) The deBroglie wavelength of the electron emitted is $66667 nm$
(B) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube
(C) The cathode rays start from cathode and move towards anode
(D) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube

Identify the correct statements about alkali metals
A. The order of standard reduction potential $\left( M ^{+} \mid M \right)$for alkali metal ions is $Na > Rb > Li$
B. $CsI$is highly soluble in water.
C. Lithium carbonate is highly stable to heat.
D. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic.
E. All the alkali metal hydrides are ionic solids.
Choose the correct answer from the options given below:

Assume that the radius of the first Bohr orbit of hydrogen atom is $0.6Å$. The radius of the third Bohr orbit of $He^+$is _______ picometer. (Nearest Integer)

Choose the correct answer :

1. Production of iron in blast furnace follows the following equation

Fe3O4(s)+4CO(g)→3Fe(I)+4CO22(g)

when 4.640 kg of Fe₃O₄ and 2.520 kg of CO are allowed to react then the amount of iron (in g) produced is

[Given : Molar Atomic mass (g mol^–1) : Fe = 56

Molar Atomic mass (g mol^–1) : O = 16

Molar Atomic mass (g mol^–1) : C = 12]

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The ionic radii of $O^{2–}$ and $Mg^{2+}$ are same.
Reason (R) : Both $O^{2–}$ and $Mg^{2+}$ are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below.

Which of the following statements are correct?

The electronic configuration of Cr is [Ar] 3d⁵4s¹.
The magnetic quantum number may have a negative value.
In the ground state of an atom, the orbitals are filled in order of their increasing energies.
The total number of nodes are given by n – 2.

Choose the most appropriate answer from the options given below :

How many neutrons and protons are there in the following nuclei? $_{6}^{13}\textrm{C}$, $_{8}^{16}\textrm{O}$, $_{12}^{24}\textrm{Mg}$, $_{26}^{56}\textrm{Fe}$, $_{38}^{88}\textrm{Sr}$.

Write the complete symbol for the atom with the given atomic number (Z) and atomic mass (A)
(i) Z = 17, A = 35
(ii) Z = 92, A = 233
(iii) Z = 4, A = 9

Find the energy of each of the photons which (i) corresponds to light of frequency 3×10¹⁵ Hz. (ii) have a wavelength of 0.50 Å

A 25 watt bulb emits monochromatic yellow light of wavelength of 0.57µm. Calculate the rate of emission of quanta per second.

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate the threshold frequency (ν₀) and work function (W₀) of the metal.

(i) Write the electronic configurations of the following ions: (a) H^– (b) Na⁺ (c) O₂^– (d) F^–
(ii) What are the atomic numbers of elements whose outermost electrons are represented by (a) 3s¹ (b) 2p³ and (c) 3p⁵?
(iii) Which atoms are indicated by the following configurations? (a) [He] 2s¹ (b) [Ne] 3s² 3p³ (c) [Ar] 4s² 3d¹.

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

An electron is in one of the 3d orbitals. Give the possible values of n, l and ml for this electron.

An atom of an element contains 29 electrons and 35 neutrons. Deduce (i) the number of protons and (ii) the electronic configuration of the element.

Give the number of electrons in the species H⁺₂ , H₂ and O⁺₂.