write formulas for the binary ionic compounds formed between the follwing elements a) sodium and iodine b) calcium and sulfur c) zinc and chlorine d) barium and fluorine e) lithium and oxygen
NaI
CaS
ZnCl2
BaF2
Li2O
To write the formulas for binary ionic compounds, you need to determine the charges of the individual ions and balance them to form a neutral compound. Here are the formulas for the binary ionic compounds formed between the given elements:
a) Sodium and Iodine:
- Sodium (Na) is a Group 1 element, 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 compound formed is NaI.
b) Calcium and Sulfur:
- Calcium (Ca) is a Group 2 element, so it has a charge of +2.
- Sulfur (S) is in Group 16, so it has a charge of -2.
The charges are balanced by using the smallest whole numbers, so the formula for the compound formed is CaS.
c) Zinc and Chlorine:
- Zinc (Zn) is a Transition Metal and can form different cations. In this case, it forms a +2 ion.
- Chlorine (Cl) is in Group 17 and has a charge of -1.
Balancing the charges, we get ZnCl2 as the formula for the compound formed.
d) Barium and Fluorine:
- Barium (Ba) is a Group 2 element, so it has a charge of +2.
- Fluorine (F) is in Group 17 and has a charge of -1.
After balancing the charges, we get BaF2 as the formula for the compound formed.
e) Lithium and Oxygen:
- Lithium (Li) is a Group 1 element, so it has a charge of +1.
- Oxygen (O) is in Group 16 and typically has a charge of -2.
To balance the charges, we need two lithium ions for every one oxygen ion. Therefore, the formula for the compound formed is Li2O.