Covalent compounds
Sharing of electrons
Chemical Bonds
•Ionic Bond
–Transfer of electron
–Exist in a crystal latticeform
•Covalent Bond
–Pairs of electrons areshared
–1 bond = 2 electrons
–Called a molecule
–Still trying to satisfy theoctet rule (severalexceptions)
Diatomics – why do they always comein two in their elemental form?
•Flourine
•One covalent bond: F-F
Oxygen
Nitrogen
Naming covalent compounds
•The first element is named first – entireelement name
•Second element in the formula is named usingthe root of the word and the ending –ide.
•Prefixes are used to indicate the number ofatoms of each type that are present in thecompound
•Exception – the first element never uses mono-
Naming Covalents (cont’d)
•1 – mono
•2 – di
•3 – tri
•4 – tetra
•5 - penta
•6 – hexa
•7 – hepta
•8 – octa
•9 – nona
•10 – deca
Examples
•H2O
–Dihydrogen monoxide
•NH3
–Nitrogen trihydride
•N2O
–Dinitrogen monoxide
You try….
•CCl4
•As2O3
•CO
•P2O5