* atomic Model Test Review guide *

covalent bonds

Covalent bonds involve shared electron pairs between atoms. Each atom contributes one electron to each shared pair, and effectively gains an additional electron from the shared pair.

Octet Rule

atoms combine either by transfer of valence electrons from one atom to another (gaining or losing) or by sharing of valence electrons

Ionic Bond

the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions.

Ion

an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons

Be able to find the formulas of covalent compounds

· Name the element furthest: left

Drop the last syllable of the 2nd element: and add ide

· 1 is: mono, 2 di, 3 tri,4 tetri, 5 Penta, 6 hexa

Examples: CO2: carbon dioxide CO: carbon monoxide N2H6: dinitrogen hexahydride