Chemistry Constants

Number of constituent particles (usually atoms or molecules) that are contained in the amount of substance given by one mole.

Relates the average relative kinetic energy of particles in a gas with the thermodynamic temperature of the gas.

A fundamental physical constant characteristic of the mathematical formulations of quantum mechanics.

Planck constant divided by 2π.

Universal physical constant important in many areas of physics.

Magnitude of electric charge per mole of electrons.

Equivalent to the Boltzmann constant, but expressed in units of energy per temperature increment per mole.

One twelfth of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state.

Electric charge carried by a single proton or, equivalently, the magnitude of the electric charge carried by a single electron.

Atomic Number: 1. The lightest element. A colorless, odorless, tasteless, non-toxic, and highly combustible diatomic gas.

Atomic Number: 2. A colorless, odorless, tasteless, non-toxic, inert, monatomic gas.

Atomic Number: 3. A soft, silvery-white alkali metal.

Atomic Number: 4. A steel-gray, strong, lightweight and brittle alkaline-earth metal.

Atomic Number: 5. A low-abundance element in the Solar System and in the Earth's crust.

Atomic Number: 6. A tetravalent nonmetal. Known for forming a vast number of compounds, essential to life.

Atomic Number: 7. A common nonmetal gas, forming about 78% of Earth's atmosphere.

Atomic Number: 8. A highly reactive nonmetal and an oxidizing agent.

Atomic Number: 9. The most electronegative element, extremely reactive.

Atomic Number: 10. A noble gas. Colorless, odorless, inert monatomic gas under standard conditions.

Atomic Number: 11. A soft, silvery-white, highly reactive alkali metal.

Atomic Number: 12. A shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table.

Atomic Number: 13. A silvery-white, soft, nonmagnetic and ductile metal in the boron group.

Atomic Number: 14. A hard, brittle crystalline solid with a blue-grey metallic lustre.

Atomic Number: 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus.

Atomic Number: 16. An abundant, multivalent and nonmetallic element.

Atomic Number: 17. A yellow-green gas under standard conditions.

Atomic Number: 18. A noble gas. The third-most abundant gas in the Earth's atmosphere.

Atomic Number: 19. A silvery-white metal that is soft enough to be cut with a knife with little force.

Atomic Number: 20. An alkaline earth metal. The fifth most abundant element in the Earth's crust.

Atomic Number: 26. A metal in the first transition series.

Atomic Number: 29. A soft, malleable, and ductile metal with very high thermal and electrical conductivity.

Atomic Number: 47. A soft, white, lustrous transition metal.

Atomic Number: 79. A bright, slightly reddish yellow, dense, soft, malleable, and ductile metal.

Atomic Number: 82. A heavy metal that is denser than most common materials.

Atomic Number: 92. A silvery-grey metal in the actinide series of the periodic table.