C3. Atoms, Elements, and Compounds

Atomic Structure & Electron Shell Builder

Assemble subatomic particles (protons, neutrons, electrons) to construct Bohr atoms. Learn electron arrangement trends (2,8,8) and identify periodic group properties.

Virtual Viewport
NCarbon (C)
Valence Electrons: 4

Active Sliders

p⁺Protons Count6qty
118

Defines the atomic number and element identity.

n⁰Neutrons Count6qty
122

Contributes to atomic mass and isotopes.

e⁻Electrons Count6qty
118

Populates Bohr orbit shells.

Syllabus Objectives

  • State relative charges and masses of protons, neutrons, and electrons
  • Determine electron shell configuration for atomic numbers 1 to 18
  • Relate valence electrons to group number in periodic table.

Mathematical Equations

Mass Number
A = protons + neutrons
Electron Shell Capacity
Max = 2 n²

Inquiry Guide Sheet

1

Build a Carbon atom (6 protons, 6 neutrons, 6 electrons). Record its configuration (2,4).

2

Add electrons. Notice how the first ring fills at 2 and the second fills at 8.

3

Verify that elements with 8 valence electrons belong to Group 0 (Noble Gases).