Ionic Radius: The radii of anions and cations in crystalline ionic compounds, as determined by consistently partitioning the center-to-center distance of ions in those compounds.

 

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Ionic Radius: The radii of anions and cations in crystalline ionic compounds, as determined by consistently partitioning the center-to-center distance of ions in those compounds.

Atomic Radius: One half the distance between nuclei of atoms of the same element, when the atoms are bound by a single covalent bond or are in a metallic crystal. The radius of atoms obtained from covalent . . . View Full Definition

Ionic: A classical greek and latin double foot consisting of two unstressed syllables and two stressed syllables, either ionic a majore / ' ' ~ ~ / or ionic a minore / ~ ~ ' ' /.

Ionic Bond: A chemical bond in which atoms of opposite charge are held together by electrostatic attraction.

Human Chorionic Gonadotropin (HCG): A peptide hormone secreted by the chorion that prolongs the life of the corpus luteum and prevents the breakdown of the uterine lining.

Chorionic Villus Sampling: An invasive prenatal diagnostic procedure involving removal of villi from the human chorion to obtain chromosomes and cell products for diagnosis of disorders in the human embryo.

Bohr Radius: The atomic unit of length, equal to 0.529 177 2083 × 10-10 m, with an uncertainty of 0.000 000 0019 × 10-10 m [1998 CODATA values]

Chorionic Villi Sampling (CVS): A method of prenatal testing in which fetal cells from the fetal side of the placenta (chorionic villi) are extracted and analyzed for chromosomal and biochemical defects.

Ionic Compound: A compound made of distinguishable cations and anions, held together by electrostatic forces.

Complete Ionic Equation: A balanced equation that describes a reaction occurring in solution, in which all strong electrolytes are written as dissociated ions.