Absolute Zero
Actin
Atom
Element
Amino Acid
Quark
Compund
Acid Precipitation
A chemical substance consisting of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition.
The lowest theoretically attainable temperature (at which the kinetic energy of atoms and molecules is minimal)
A species of atoms having the same number of protons in their atomic nuclei (i.e. the same atomic number, Z).
A class of organic compounds containing an amino group and a carboxylic acid group
One of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form.
Rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water.
An elementary particle and a fundamental constituent of matter.
The smallest component of an element having the chemical properties of the element
