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
Actinides
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
Accuracy
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
Atom
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
Anion
the mixing of air into a liquid or solid
Aeration
a compound that, when dissolved in water, gives a pH of less than 7.0 or a compound that donates a
hydrogen ion
Acid
a structure that forms because of a collision between molecules while new bonds are formed
Activated complex
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