Write formulas for the binary ionic compounds formed between the following elements:
a. Sodium and Iodine
b. Calcium and sulfur
c. Zinc and Chlorine
d. Barium and Fluorine
e. Lithium and Oxygen
sodium iodide?
calcium sulfide?
Zinc chloride?
So, on binary compounds between metals and nonmetals, use -ide.
To determine the formulas for binary ionic compounds, you need to know the charges of the elements involved. The charge of an element can be determined from its position in the periodic table.
a. Sodium (Na) is in Group 1, so it has a charge of +1. Iodine (I) is in Group 17, so it has a charge of -1. Therefore, the formula for the binary ionic compound formed between sodium and iodine is NaI.
b. Calcium (Ca) is in Group 2, so it has a charge of +2. Sulfur (S) is in Group 16, so it has a charge of -2. Therefore, the formula for the binary ionic compound formed between calcium and sulfur is CaS.
c. Zinc (Zn) is in Group 12, so it has a charge of +2 for ionic compounds. Chlorine (Cl) is in Group 17, so it has a charge of -1. Therefore, the formula for the binary ionic compound formed between zinc and chlorine is ZnCl2.
d. Barium (Ba) is in Group 2, so it has a charge of +2. Fluorine (F) is in Group 17, so it has a charge of -1. Therefore, the formula for the binary ionic compound formed between barium and fluorine is BaF2.
e. Lithium (Li) is in Group 1, so it has a charge of +1. Oxygen (O) is in Group 16, so it has a charge of -2. Therefore, the formula for the binary ionic compound formed between lithium and oxygen is Li2O.
Remember to always balance the charges to determine the correct formula for binary ionic compounds.
a. Sodium and Iodine: NaI
b. Calcium and Sulfur: CaS
c. Zinc and Chlorine: ZnCl2
d. Barium and Fluorine: BaF2
e. Lithium and Oxygen: Li2O