Please help me I need an answer ASAP

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 many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Define dew point. i am writing this part to be able to ask the question