Which statement describes a crystal of salt

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. : )

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

How many molecules of sucrose c12h22o11 are there in 454 grams of sucrose