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Unit 3 : bonding

TermDefinition
electron configuration the arrangement of electrons in an atom
covalent bond a bond formed when atoms share one or more pairs of electrons
ionic bond a force that attracts electrons from one atom to another wich transforms a neutral atom
ion an atom , radical or molecule that has gained or lost one or more electrons and has a negative or positive charge
Lewis dot structure a structural formula in which electrons are represented by dots ; dot pair or dashes between two atomic symbols representt pairs in covalent bonds
octet rule a chemical rule of thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons
metallic bond a bond formed by the attraction between positively charged metal ions and the electrons around them
conductivity the ability of valence electrons in a substance to freely move
polar describes a molecule in which the positive and negative charges are separated
nonpolar consisting of molecules not having a dipole a nonpolar solvent.
bent a kind of molecular geometry in which the central atom has two lone pairs of electrons and is associated with two bond pairs.
tetrahedral A carbon atom with four attachments, and bond angles of approximately 109.5o.
trigonal planar one atom in the centre and three atoms at the corners of an equilateral triangle, known as peripheral atoms, all in the same plane.
linar A molecule or polymer with a single backbone; each monomer molecule is bonded to at most two other monomer molecules
valence electrons an electron that is found in the outermost shell of an atom and that determines the atoms chemical properties
formula unit the chemical formula of an ionic compound that lists the ions in the lowest ratio that equals a neutral electrical charge.
polyatomic ion ions which consist of more than one atom
vesper theory a theory that predicts some molecular shapes based on the idea that pairs of valence electrons surrounding an atom repel each other
Created by: il464975
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