Free Atomic Structure MCQs with Answers

• A. Aufbau Principle
• B. n+I Rule
• C. Hund's Rule
• D. Pauli's Exclusion Principle

Explanation: According to Hund's rule every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and…

• A. Aufbau Principle
• B. n + l rule
• C. Hund's rule
• D. Pauli exclusion principle

Explanation: Hund's rule explains the electronic configuration of degenerate orbitals

• A. Li+2
• B. H+
• C. He+
• D. Be

Explanation: The charge to mass ratio is called the e/m ratio. e/m ratio is a physical quantity, widely used in the electrodynamics of charged…

• A. 18
• B. 10
• C. 17
• D. 8

Explanation: Option A: This option suggests that the chloride ion (Cl-) has 18 valence electrons. However, this is incorrect.

• A. 2(l+1)
• B. l+1
• C. n+l
• D. 2(n+l)

Explanation: The arrangement of subshells or orbitals within an atom is based on the principle known as the Aufbau principle.

• A. 50
• B. 49
• C. 48
• D. 44

Explanation: No. of (proton=electron)=(atomic no.)No. of neutron=Atomic no. - no. of protonIn case of H2SO4,H2 = 2 protons & 2electronS = 16…

• A. 24
• B. 5
• C. 72
• D. 98

Explanation: Calculate this by using the 2n2 formula. In the formula 2n², n = 7 so 2(7)², 2(49), "98".

• A. Half filled subshell
• B. Completely filled subshell
• C. Partially filled subshell
• D. Bought Options A and B are correct

Explanation: As per Hund's rule, atoms with half-filled or completely-filled orbitals are comparably more stable, so removing an electron from such…

• A. Number of electrons
• B. Number of Unpaired electrons
• C. Number of Paired electrons
• D. Number of Protons

Explanation: Melting point: The constant temperature at which a solid changes into liquid is called melting point.

• A. n2
• B. 2n2
• C. 2n
• D. 3n

Explanation: Option BThe number of electrons accommodated in an orbit is given by 2n2.

• A. Electronic configuration
• B. Ionic size
• C. Reactivity
• D. pH

Explanation: Isoelectronic species are atoms, ions, or molecules that have the same number of electrons and therefore the same electronic…

• A. beings-block elements
• B. inert gas configurations
• C. ns1 electronic configuration
• D. being metals

Explanation: Second ionization energy can be defined as the removal of one mole of electron from the one mole of monovalent gaseous cation of the…

• A. [He] 2s1
• B. [Ne] 3s1
• C. [Ne] 3s2
• D. [He] 2s2

Explanation: Option A) [He] 2s1 is incorrect because the electronic configuration of helium (He) has only two electrons in its 1s orbital, and…

• A. [Ar] 4s23d4
• B. [Ar] 4s23d5
• C. [Ar] 4s13d4
• D. [Ar] 4s13d5

Explanation: The atomic number of Cr is 24. Its electronic configuration is as follows;[Ar]4s13d5If we follow the AufBau principle, it should have been…

• A. 8
• B. 32
• C. 18
• D. 25

Explanation: The maximum number of electron that can accommodate in a shell is given by the formula 2n2.

• A. Half filled subshell
• B. Completely Filled Subshell
• C. Partially filled subshell
• D. Both A and B

Explanation: Half-filled subshells and completely filled subshells have a symmetrical distribution of electrons e.g. p3 or p6.

• A. E = hc/v
• B. E = c/v
• C. E = cv
• D. None of these options are correct

Explanation: The equation for Planck's quantum theory is:E = hfwhere E is the energy of a photon, h is Planck's constant (6.626 x 10^-34…

• A. 6.626 x 10^-3 kJs
• B. 6.262 x 10^-3 Js
• C. 6.626 x 10^-34 Js
• D. 6.262 x 10^3 kJs

Explanation: Remember the value of Planck's constant 'h' is 6.626 × 10-34 Js or 6.26 × 10-37 kJs.

• A. E = hcv
• B. E = c/v
• C. E = cv
• D. None of these options are correct

Explanation: According to Planck's quantum E = hvE = hc/XE = hc/v

• A. 10
• B. 6
• C. 18
• D. 0

Explanation: In this case l = 2then m = −2,−1,0,+1,+2so there are 5 orbitals and each orbital contain 2 electronsSo for value n = 3 and l= 2 there are…