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6C12.011
Reactive Nonmetalssolid at STPP-block

Carbon

Group: 14Period: 2Standard Atomic Weight: 12.011 u

Why is Carbon in this position?

Understanding the scientific rationale behind Carbon's position in the periodic table:

Group Assignment
Group 14

Belongs to Group 14 because it has 4 valence electrons (2s² 2p²).

Period Assignment
Period 2

Belongs to Period 2 because its outermost electrons fill the n=2 shell.

Orbital Block
P-block

Belongs to the p-block because its valence electrons fill 2p orbitals.

Chemical Category
Reactive Nonmetals

Classified as a reactive nonmetal due to its moderate electronegativity (2.55) and versatility in forming covalent molecular compounds.

Atomic Structure & Bohr Shell Model

Shell Distribution: [2, 4]

Bohr Atomic Shell Model(2, 4)

Hover or tap any shell orbit ring to inspect electron counts and 2n² capacities.

6 Protons (p⁺)6 Neutrons (n⁰)
KShell K: Electron 1 of 2Shell K: Electron 2 of 2LShell L: Electron 1 of 4Shell L: Electron 2 of 4Shell L: Electron 3 of 4Shell L: Electron 4 of 4CZ = 6

Educational Note: This Niels Bohr planetary model visually illustrates principal quantum energy shells ($n=1, 2, 3\dots$) and electron counts. In modern quantum mechanics (Schrödinger model), electrons do not orbit in fixed circular planetary tracks, but exist as 3D probability clouds (orbitals: $s, p, d, f$) governed by the Heisenberg uncertainty principle.

Electron Shell Filling Breakdown

Shell K (n=1):2 / 2 electrons (100%)
Shell L (n=2):4 / 8 electrons (50%)
Aufbau Electron Configuration
1s² 2s² 2p²

Neutral ground state configuration. Valence electrons: 4.

Atomic & Quantum Properties

Electronegativity (Pauling)2.55 Pauling
1st Ionization Energy1086.5 kJ/mol
Electron Affinity-121.8 kJ/mol
Atomic Radius (empirical)67 pm
Common Oxidation States+4, +2, -4
Crystal StructureHexagonal / Cubic

Physical & Thermal Properties

Density at STP2.267 g/cm³ (graphite)
Melting Point3550 °C (3823 K)
Boiling Point4027 °C (4300 K)
Magnetic OrderingDiamagnetic
Discovery YearAncient
Discovered ByKnown since prehistoric antiquity

Real-World Uses, Occurrence & Compounds

Major Industrial & Everyday Uses
  • Carbon fiber composites for aerospace, racing vehicles, and sports gear
  • Diamond jewelry, abrasives, and high-pressure anvil cells
  • Graphite electrodes, battery anodes, and dry lubricants
  • Base element of fossil fuels, plastics, pharmaceuticals, and synthetic polymers
Occurrence in Nature

Abundant as elemental coal, graphite, and diamond; as CO₂ in air; in limestone (CaCO₃); and in all biological matter.

Etymology & Name Origin

From Latin 'carbo' meaning coal or charcoal

Important Chemical Compounds
CO₂ (Carbon dioxide)
CH₄ (Methane)
C₆H₁₂O₆ (Glucose)
CaCO₃ (Calcium carbonate)
C₂H₅OH (Ethanol)
Interesting Chemical Facts
  • Carbon exhibits polar opposite allotropes: soft, electrically conductive black graphite vs. transparent, insulating, super-hard diamond.
  • Graphene, a single atom thick sheet of sp² carbon, is the thinnest and strongest material ever measured.
  • The radioactive isotope Carbon-14 (half-life 5,730 years) enables precision archaeological dating of ancient artifacts.
Safety & Handling Note

Elemental carbon is biologically inert and safe, but carbon monoxide (CO) gas is a lethal, tasteless, odorless poison.