the number representing an element which corresponds with the number of protons within the nucleus

Atomic number

atomic numbers 90-103; shows more variable valency than lanthanoids; all actinides are radioactive; all but thorium and uranium are man made


the metals of Group 1 on the periodic table

Alkali metals

a theoretical condition concerning a system at zero Kelvin where a system does not emit or absorb energy (all atoms are at rest)

Absolute zero

how close a value is to the actual or true value


a compound with two acyl groups bound to a single oxygen atom

Acid anhydride

an equilibrium constant for the dissociation of a weak acid

Acid dissociation constant

within organic chemistry, when two or more molecules combine to make a larger one

Addition reaction

a chemical element in its smallest form, and is made up of neutrons and protons within the nucleus and electrons circling the nucleus


the metals of Group 2 on the periodic table

Alkaline earth metals

the region where the electron of the atom may be found

Atomic orbital

negatively charge ions


the mixing of air into a liquid or solid


a compound that, when dissolved in water, gives a pH of less than 7.0 or a compound that donates a hydrogen ion


a structure that forms because of a collision between molecules while new bonds are formed

Activated complex

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