Atomic Structure – Interactive Quiz & Cheatsheet

Boost your understanding of atomic models, quantum mechanics, and electron configurations with this interactive learning tool

Updated: 1 day ago

Categories: Mini Game, Chemistry, Class 11, Physical Chemistry
Tags: Mini Game, Chemistry, Class 11, Atomic Structure, Bohr Model, Quantum Numbers, Electron Configuration
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Atomic Structure Cheatsheet & Quiz

Atomic Structure Cheatsheet

Cheat Codes & Shortcuts

  • Atom: Smallest unit of matter, composed of protons, neutrons, electrons.
  • Atomic Number (Z): Number of protons in the nucleus.
  • Mass Number (A): Total number of protons and neutrons.
  • Isotopes: Atoms with same Z, different A.
  • Electron Configuration: Distribution of electrons in shells & subshells.
  • Aufbau Principle: Electrons fill lowest energy orbital first.
  • Pauli Exclusion Principle: No two electrons have same set of quantum numbers.
  • Hund's Rule: Orbitals in same subshell get one electron each before pairing.
  • Bohr's Model: Electrons revolve in discrete orbits with quantized energy.
  • Quantum Numbers: n, l, m, s — describe properties/position of electrons.

Quick Reference Table

Term Definition / Formula Example / Note
Atomic Number (Z) Number of protons Carbon: Z = 6
Mass Number (A) Protons + Neutrons C-12: 6p + 6n = 12
Isotope Same Z, diff. A C-12 & C-14
Electron Configuration Arrangement of electrons C: 1s22s22p2
Bohr's Radius \( r_n = n^2 a_0 \) First orbit: n=1, r1=0.529Å
Quantum Numbers n, l, m, s n=principal, l=azimuthal, m=magnetic, s=spin

Advice

Step 1: Determine atomic number & mass number from periodic table.

Step 2: Write electron configuration using Aufbau order.

Step 3: Apply Pauli & Hund rules for electrons in orbitals.

Step 4: Use quantum numbers for detailed electron position.

Step 5: Isotope problems: Same Z, use A to find neutrons.

Atomic Structure Quick Tips

  • Atomic number (Z): Always equals number of protons and electrons (neutral atom).
  • Mass number (A): A = Z + neutrons.
  • Aufbau order: Fill orbitals: 1s → 2s → 2p → 3s → 3p → 4s → 3d...
  • Pauli exclusion: Max 2 electrons per orbital, opposite spins.
  • Quantum numbers: For the nth shell, max electrons = 2n2.

Atomic Structure Speed Quiz

Test your speed with 5 atomic structure questions! You have 30 seconds per question.