| alkaline-earth metal |
any of a group of highly reactive chemical elements, such as calcium and magnesium, that are typically divalent cations and form compounds with various other elements. |
| alkalinize |
to produce an alkali from (a chemical group). [1/2 definitions] |
| allomerism |
change in chemical composition without accompanying change in crystalline form. |
| allomorph |
any of several alternate structural forms of the same chemical compound; paramorph. [1/2 definitions] |
| allotrope |
one of several forms in which a chemical element may exist. |
| allotropy |
the existence of some chemical elements in more than one structural form. |
| alum |
an astringent chemical solid used as a styptic and in tanning and dyeing. [1/2 definitions] |
| aluminum |
a chemical element that has thirteen protons in each nucleus, occurs commonly in ores such as bauxite, and in pure form is a strong lightweight corrosion-resistant silvery metal with many industrial uses. (symbol: Al) |
| Am |
symbol of the chemical element americium. |
| amaranth |
a purplish red chemical dye. [1/3 definitions] |
| americium |
a synthetic radioactive chemical element that has ninety-five protons in each nucleus. (symbol: Am) |
| amino |
of, relating to, or containing an amine or other chemical substance formed by anitrogen-hydrogen group in combination with nonacidic organic compounds. |
| ammonia |
the pungent gas formed from the chemical combination of nitrogen and hydrogen, used esp. in refrigeration and in making fertilizers. [1/2 definitions] |
| ammonium |
the ion resulting from the chemical combination of ammonia and a hydrogen ion. |
| anhydride |
a chemical compound derived from another through the removal of water. |
| antimony |
a chemical element that has fifty-one protons in each nucleus and forms a brittle bluish white metal crystal, used in hard alloys, electrical components, and medicines. (symbol: Sb) |
| Ar |
symbol of the chemical element argon. |
| argon |
a chemical element of the inert gas group that has eighteen protons in each nucleus. (symbol: Ar) |
| arsenic |
a poisonous chemical element that has thirty-three protons in each nucleus and occurs in brittle, grayish white crystalline masses or in yellow or black allotropes. (symbol: As) [1/2 definitions] |
| As |
symbol of the chemical element arsenic. |
| asbestos |
one of two forms of a mineral that can be separated into fibers, is not combustible, and is resistant to chemical action, used to make fireproofing and insulating materials. [1/2 definitions] |