Element 6

Carbon (C)

Reactive nonmetal · Period 2 · Group 14 · p-block

Carbon (C) is element 6 of the periodic table, a reactive nonmetal in period 2, group 14 (p-block) with an atomic mass of 12.011 and is a solid at standard conditions.

At a glance

Atomic number
6
Symbol
C
Atomic mass
12.011 u
Category
Reactive nonmetals
Period
2
Group
14
Block
p-block
Phase at STP
solid

Electron structure

Electron configuration
1s2 2s2 2p2
Shorthand configuration
[He] 2s2 2p2
Electrons per shell
2, 4
Oxidation states
-4, -3, -2, -1, 0, +1, +2, +3, +4

Physical properties

Melting point
3,823 K (3,549.85 °C)
Boiling point
4,098 K (3,824.85 °C)Carbon sublimes at ordinary pressure; the melting point applies only under high pressure.
Density
2.267 g/cm³
Phase
solid

Atomic properties

Electronegativity (Pauling)
2.55
Atomic radius
67 pm
Covalent radius
76 pm
Van der Waals radius
170 pm
First ionization energy
1087 kJ/mol
Electron affinity
122 kJ/mol

Notable isotopes

Notable isotopes of Carbon: mass number, atomic mass, natural abundance, and stability.
IsotopeMassAbundanceStability
C-121298.93%Stable
C-1313.003351.07%Stable

Common uses

  • Steel production
  • Fuels
  • Plastics
  • Diamonds
  • Carbon fiber

Discovery

Discovered by
Known since antiquity
Country
Unknown

Frequently asked questions

Is carbon a metal?
No. Carbon is a nonmetal, classified as a reactive nonmetal on the periodic table.
How many protons does carbon have?
Carbon has 6 protons. Its atomic number is 6, which is also the number of electrons in a neutral atom of carbon.
What group and period is carbon in?
Carbon is in group 14 and period 2 of the periodic table, in the p-block.
What is the atomic mass of carbon?
The atomic mass of carbon is 12.011 u (unified atomic mass units).

Keep exploring

Carbon's row is on the printable element property sheet, and its tile is on the periodic table wall chart - the same numbers as above, laid out for A4 or A3 paper.