How many of yous guys know bout' fishies? Cuz I got some questions

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. : )

Write a net ionic equation to show that hydrofluoric acid, behaves as an acid in water.

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?