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.

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

Atomic Number: 6. A tetravalent nonmetal.

Atomic Number: 7. A common nonmetal gas.

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

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

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

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