What is the heaviest element on the periodic table

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. : )

What is the chemical formula of the following compound

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.