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Physical Science 18

Octet rule atoms are less stable without valence electrons, so they have a tendency to bond to fill their outer level with 8 electrons
Chemical bond force that holds atoms together by sharing, gaining, or losing electrons (how atoms pair up to help complete the 8 valence electrons)
Electronegativity ability to attract and hold electrons when bonded to other atoms (related to electron affinity; based on fluorine)
Low electronegativity metals; few valence electrons
High electronegativity nonmetals; almost 8 valence electrons
Electronegativity helps us determine the types of atoms which will bond and what type of bond they will form
Covalent share electrons; usually between nonmetals
Ionic gain or lose electrons; usually between metals and nonmetals
Metallic “share” electrons; usually between metals
Numbered subscripts how many of each atom is bonded
Covalent bonds force of attraction formed as a result of sharing electrons; elements share electrons molecules; exists only between two atoms
Polyatomic molecules more than two atoms covalently bonded
Properties of covalent bonds not as strong as ionic bonding; low melting point; gases or liquids in standard conditions(some solids); melt or decompose at a low temperature; not good conductors
Polarity determined by the difference in attraction for the electrons between the atoms covalently bonded; difference in electronegativity between bonded elements
Nonpolar no difference between electro negativities; only diatomic molecules of the same elements; equally shared
Polar large difference in electronegativities; unequally shared
Ionic attraction formed between oppositely charged ions in an ionic compound; big EN; electrons play favorites; gain or lose electrons; opposites attract
Cation positive ion
Anion negative ion
Properties of ionic bonds solids at room temperature; high melting points; dissolve in water; good conductor
Metallic bonds positive metal ions immersed in a sea of negative electrons
Properties of metallic bonds solids at room temperature; malleability(can be hammered); ductility(ability to be made into wire); good conductors of heat and electricity; shiny luster
Created by: Crayford