Question

1. potassium + bromine

formula:
name:

1. potassium + oxygen

formula:
name:

1. sodium + oxygen

formula:
name:

1. aluminum + chlorine

formula:
name:

1. calcium + fluorine

formula:
name:

1. magnesium + iodine

formula:
name:

Explanation:

Step1: Determine charges of ions

Potassium ($K$) has a +1 charge, bromine as bromide ion ($Br^-$) has a - 1 charge.

Step2: Write formula

The formula for the compound formed by potassium and bromine is $KBr$ and its name is potassium bromide.

Step3: For potassium and oxygen

Potassium has a +1 charge, oxygen as oxide ion ($O^{2 -}$) has a -2 charge. To balance the charges, we need 2 potassium atoms. The formula is $K_2O$ and its name is potassium oxide.

Step4: For sodium and oxygen

Sodium ($Na$) has a +1 charge, oxygen as oxide ion ($O^{2 -}$) has a -2 charge. We need 2 sodium atoms to balance the charge. The formula is $Na_2O$ and its name is sodium oxide.

Step5: For aluminum and chlorine

Aluminum ($Al$) has a +3 charge, chlorine as chloride ion ($Cl^-$) has a -1 charge. We need 3 chlorine atoms to balance the charge. The formula is $AlCl_3$ and its name is aluminum chloride.

Step6: For calcium and fluorine

Calcium ($Ca$) has a +2 charge, fluorine as fluoride ion ($F^-$) has a -1 charge. We need 2 fluorine atoms to balance the charge. The formula is $CaF_2$ and its name is calcium fluoride.

Step7: For magnesium and iodine

Magnesium ($Mg$) has a +2 charge, iodine as iodide ion ($I^-$) has a -1 charge. We need 2 iodine atoms to balance the charge. The formula is $MgI_2$ and its name is magnesium iodide.

Answer:

1. Formula: $KBr$, Name: Potassium bromide
2. Formula: $K_2O$, Name: Potassium oxide
3. Formula: $Na_2O$, Name: Sodium oxide
4. Formula: $AlCl_3$, Name: Aluminum chloride
5. Formula: $CaF_2$, Name: Calcium fluoride
6. Formula: $MgI_2$, Name: Magnesium iodide