1. Magnesium Bromide Step 1: Write out the charges for each ion (2pts)

Step 2: Do the charges cancel out? (1pts)

Step 3: Determine how many of each ion is needed to make the overall charge zero. (1pts)

Step 4: Write the correct formula, correct order and amount of each ion. (2pts)

2. Zinc Phosphide

Step 1: Write out the charges for each ion (2pts)

Step 2: Do the charges cancel out? (1pts)

Step 3: Determine how many of each ion is needed to make the overall charge zero. (1pts)

Step 4: Write the correct formula, correct order and amount of each ion. (2pts)

The compound formula can be determined from the charge of the constituent elements of the compound

There are several compounds :

ion compounds, covalent compounds, and polyatomic  

For ionic compounds consisting of cations (ions +) and anions (ions -)  

The naming is preceded by the cation then the anion with the -ide suffix added  

Generally for this ion compound consists of metal elements as cations and non-metals as anions  

1. Mg²⁺, Br⁻

2. no, +2(Mg) + -1(Br)=+2-1=+1

3. Mg²⁺ 1 ion, Br⁻ need 2 ion

4. MgBr₂, 1 Mg and 2 Br

1. Zn²⁺, P³⁻

2. no, +2(Zn)+ -3(P)=2-3=-1

3. Zn need 3 ion, P 2 ion

4. Zn₃P₂, 3 Zn and 2 P