How could automobiles and the use of roads create water pollution?

What does x represent in the formula for the compound xcl4?

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.