For the reaction pcl5(g) + heat pcl3(g) + cl2(g), what will happen when the temperature is decreased

1) how many electrons are in each energy level of the following elements? a. he b. na c. na d. ne 2) how many valence electrons are percent in the following atoms? a. s b. mg c. be d. cl 3) which of the following elements are stable as atoms? a. he b. o c. cl d. ar if you are able to provide the work as to how you got the answers that would be greatly appreciated. : )

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control?