Atomic Radii and Ionization Energy: Definitions and Trends, Quizzes of Chemistry

Download Atomic Radii and Ionization Energy: Definitions and Trends and more Quizzes Chemistry in PDF only on Docsity! TERM 1 Covalent Radius DEFINITION 1 L/2 where "L" is the distance of the bond length between two atoms in a diatomic molecule. TERM 2 van der Waals Radius DEFINITION 2 The van der Waals radius, r, of an atom is the radius of an imaginary hard sphere which can be used to model the atom for many purposes. Rvdw= Dvdw/2 where Dvdw is the distance between atoms on adjacent molecules TERM 3 Metallic Radius DEFINITION 3 one-half of the distance between the nuclei of two adjacent atoms in the solid crystalline metal Rmetallic= L/2 TERM 4 Isoelectronic cations and anions DEFINITION 4 Ions that have the same number of electrons but different atomic numbers (nuclear charge). The size of a number of isoelectronic ions, decreases as their atomic number (Z) increases. TERM 5 Ionization Energy DEFINITION 5 the minimum energy required to remove the highest energy electron from a gaseous atom. ionization energy is largely determined by the size of the atom Ionization energy inversely follows the periodic trend observed for atomic sizes, and decrease as atomic radii increase Within a group, top to bottom, IE decreases Within a period, left to right, IE increases