The Periodic Table of Elements

View photos of the elements

Oxidation Number Rules

Oxidation Number Rules

The sum of all the Oxidation Number, ON, over all the atoms in a chemical species is equal to the charge on the chemical species In their compounds, the alkali metals and the alkaline earths have ON of +1 and +2 respectively. In compounds the ON of fluorine is almost always . . . → Read More: Oxidation Number Rules

Ions to learn

Names of Polyatomic ions and their Charges

In this course, you will need to learn some polyatomic ions. Be sure to learn their names, formulas and their charges.

Cation: ammonium, NH4+ Anions: nitrate, NO3– acetate, C2H3O2– sulfate, SO42- hydroxide, OH– phosphate, PO43- carbonate, CO32- cyanide, CN– chlorate, ClO3– permanganate, MnO4– chromate, CrO42- dichromate, Cr2O72- . . . → Read More: Ions to learn

Solubility Rules!!

The following table summarizes the solubility ionic compounds in water formed with these common anions . Use this as a guide to predict products of chemical reactions for double-replacement reactions.

Anions Soluble Insoluble Nitrates, NO3– ALL – Acetates, C2H3O2– ALL – Chlorides, Cl– ALL, except … AgCl, Hg2Cl2, PbCl2 Sulfates, SO42- ALL*, except . . . → Read More: Solubility Rules!!

Activity Series of Metals

The following table shows the activity series for some of the more common metals in order of deceasing reactivity, with the most reactive metal at the top of the list. It should not be surprising to you to find the alkali metals at the top of the list and the more unreactive metals . . . → Read More: Activity Series of Metals