The atomic number of fluorine is 9. How many electrons does an ion of fluorine have if it is represented by the symbol shown below? 19F1-

How are elements arranged in a periodic table

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) in an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

Will mark brainliest how many electrons can be held in the energy level n = 4?