Is is really urgent and no one is me

write the formulas for the ionic compounds formed by the following:

1. potassium & iodine

2. aluminum & bromine

3. cesium & nitrate

4. aluminum & carbonate

1. KI

2. AlBr₃

3. CsNO₃

4. Al(CO₃)₃

Explanation:

Reference the periodic table to find the element symbols. For polyatomic ions (carbonate and nitrate), you should also be provided with these charts. If not, memorize them.

Write the element symbols and find their charges. For writing the ionic compounds, whether the charge is negative or positive does not matter.

To find the number of atoms for each element, use the charge of its partner. If the charge is 1, you do not need to write it.

Remove any extra brackets.

1. potassium & iodine

potassium (K) 1+

iodine  (I)  1-

KI     Since the charges are both 1, you do not need to write them.

2. aluminum & bromine

aluminum (Al) 3+

bromine  (Br) 1-

AlBr₃

3. cesium & nitrate

cesium (Cs) 1+

nitrate  (NO₃) 1-

The charges are both 1, so you do not need to write them.

Cs(NO₃)      You can remove these brackets

CsNO₃

4. aluminum & carbonate

aluminum (Al) 3+

carbonate (CO₃) 1-

Al(CO₃)₃      Keep these brackets because you have 3 of the polyatomic ion.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

the correct answer is:

a. formation of precipitation