How Elements Form Compounds - Ms. Anderson's Room 280
How Elements Form Compounds In order for atoms to have a stable valence shell, they will link up with other atoms by stealing, giving up or
sharing electrons. This is how elements combine to form compounds. There are two major types of compounds that can form between atoms: 1. Ionic compounds: where metals (+) bonds
with non-metals (-) *stealing 2. Molecular (Covalent) compounds: where nonmetals bond with other non-metals *sharing Ionic Compounds Ex: Sodium + Chlorine Here we see that Na (metal) will give its valence electron to Cl (non-metal) so that they both have
stable shells! Once this happens, the ionic charge of Na will be 1+ and the ionic charge of Cl will be 1-. These two opposing charges will attract each other and a chemical bond will be formed creating the compound sodium chloride (NaCl) Sometimes, more than one electron can be
transferred! Ex: Calcium + oxygen This compounds name is Sometimes, more than one atom of each element will have to be involved. Ex: calcium + chlorine
This compounds name is Naming Compounds Ionic
Compounds Write the name of the first element as it appears on the periodic table Change the ending of the second element to -ide Example: NaCl
Sodium Chloride Naming Ionic Compounds Name the following Ionic Compounds: Be3N2 LiF MgCl2
CaO AlF3 K2S ZnBr2
CaBr2 Build Be3N2 What do you notice about the overall charge of the ionic compound if you add the metals charges with the non-metals
charge? Naming when you have metals with more than one Charge Some metals make more than one ionic charge. Most of these are found in the transition metals on the PT If you use a metal that can make more than one ionic charge, you must use a roman numeral following the
metals name in indicate which ion charge was used. The name of the non-metal still ends in -ide. NOTE: The little number in the formulas is NOT its charge! It represents HOW MANY of the ions are used in the formula. Build the following molecules with your ion fit kit and then give them a name in your notes.
CuBr FeO CuBr2 Fe2O3
NiI3 Sn3N2 NiI2 Sn3N4
What pattern appears between the charges of the ions and how many of each ion there are in the formula? Naming with Polyatomic Ions: A polyatomic ion is a group of atoms that together hold an overall ionic charge If a polyatomic ion is in a formula, just state its name
as written. You do NOT change its ending. Build the following molecules with your ion fit kit and then give them a name in your notes. Na2SO4 NH4Cl
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