CHEM 4701 Lecture Notes - Lecture 16: Methamphetamine, Pus, Electronegativity

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25 Dec 2014
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12:17 pm: effective atomic radius - rcov rcov = 1/2 distance or a purely covalent bond has to be a single bond btwn 2 atoms of the same element so that they have same electronegativity. H-h rcov,h = (1/2)(h2) < 0. 529 angstroms ---> = 0. 37 angstroms. As you go down a column, rcov increases b/c valence electrons have greater n as you go down (higher shell) As you go across a row, rcov decreases b/c effective nuclear charge (zeff) increases. Electrons are good at shielding electrons in shell above them, but not in shells that are the same. Li: zeff = 1. 3 be: zeff = 1. 95 rcov,li = 1. 34 angstroms rcov,be: angstroms: ionization energy (ie) Energy needed to remove electron from valence shell (take it from radius length to infinity) 2nd ie a+ (g) --------> a2+ (g) + e- (g) + e- Ie goes down as you go down a column b/c zeff decreases.

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