What is the SI unit for weight

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. : )

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.