Memory Work -- Elements you need to know.

Group A (based on group#)

H

^1+

He

^0

Li

^1+

Be

^2+

B

^3+

C

^2+,4+,4-

N

^3-

O

^2-

F

^1-

Ne

^0

Na

^1+

Mg

^2+

Al

^3+

Si

^2+,4+,4-

P

^3-

S

^2-

Cl

^1-

Ar

^0

K

^1+

Ca

^2+

Ga

^3+

Ge

^4+

Se

^2-

Br

^1-

Kr

^0

Rb

^1+

Sr

^2+

In

^3+

Sn

^2+,4+

I

^1-

Xe

^0

Cs

^1+

Ba

^2+

Tl

^1+,3+

Pb

^2+,4+

Rn

^0

Fr

^1+

Ra

^2+

Group B (transition elements)

Silver	Ag	^1+	Iron	Fe	^2+,3+	Tin	Sn	2+,4+
Copper	Cu	^1+,2+	Cobalt	Co	^2+,3+	Lead	Pb	^2+,4+
Mercury	Hg	^1+,2+	Nickel	Ni	^2+,3+	Titanium	Ti	^3+,4+
Gold	Au	^1+,3+	Chromium	Cr	^2+,3+,6+	Arsenic	As	^3+,5+
Zinc	Zn	^2+	Manganese	Mn	^2+,4+	Antimony	Sb	^3+,5+
Cadmium	Cd	^2+	Platinum	Pt	^2+,4+	Tungsten	W	^6+

Polyatomic Ions

Acetate	C2H3O2 ^1-	Oxalate	C2O4 ^2-
Chlorate	ClO3 ^1-	Sulfate	SO4 ^2-
Nitrate	NO3 ^1-	Peroxide	O2 ^2-
Cyanide	CN ^1-	Thiosulfate	S2O3 ^2-
Hydroxide	OH ^1-	Carbonate	CO3 ^2-
Amide	NH2 ^1-	Chromate	CrO4 ^2-
Permanganate	MnO4 ^1-	Dichromate	Cr2O7 ^2-
Iodate	IO3^1-	Silicate	SiO3 ^2-
Bromate	BrO3 ^1-	Arsenate	AsO4 ^3-
Ammonium	NH4 ^1+	Phosphate	PO4 ^3-

Polyatomic Ions Rules for –ATE based ions:

1. Add one oxygen changes name to hyper____ate, keeps the same charge.
2. Remove one oxygen changes ending to ___ite, keeps the same charge.
3. Remove two oxygens changes name to hypo____ite, keeps the same charge.

For example the chlorate based ions:

ClO₄ ^1- hyperchlorate

ClO₃ ^1- chlorate

ClO₂ ^1- chlorite

ClO ^1- hypochlorite

Adding hydrogen to a polyatomic ion: reduce the charge by 1. The prefix bi- can be used to express the hydrogen.

For example:

PO₄ ^3- phosphate

HPO₄ ^2- hydrogen phosphate or biphosphate