Arsenic

Arsenic is a chemical element with the symbol As, and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid.

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Arrhenius acid

An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons. In other words, it increases the number of H+ ions in the water.
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Block co-polymer

A block co-polymer is a co-polymer formed when the two monomers cluster together and form 'blocks' of repeating units.
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Ion

An ion is an atom or molecule that has a net electrical charge. Since the charge of the electron is equal and opposite to that of the proton, the net charge of an ion is non-zero due to its total number of electrons being unequal to its total number of protons.
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Binary acids

Binary acids are certain molecular compounds in which hydrogen is combined with a second nonmetallic element; these acids include HF, HCl, HBr, and HI. HCl, HBr, and HI are all strong acids, whereas HF is a weak acid.
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Anti-bonding

#Antibonding orbital is a type of molecular orbital (MO) that weakens the chemical bond between two atoms and helps to raise the energy of the molecule relative to the separated atoms.
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Angstrom

#Angstrom or #ångström is a unit of length equal to 10⁻¹⁰ m; that is, one ten-billionth of a metre, 0.1 nanometre, or 100 picometres.
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