How many electrons does Helium need to have a full outer shell

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

What is the value of keq for the reaction expressed in scientific notation?

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?