How do lines in an atomic emission spectrum provide evidence that electrons can only exist in specific energy levels within an atom?

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

As cooking food that has to go in the oven

C. 6.94 is the correct answer y'all