When do electrons emit energy? only when orbiting around nucleus only when knocked out of orbit when moving to a higher orbit when moving to a lower orbit

Maybe you should get some from your teacher and learn more so you can get your grades up and maybe study a bit more

Hi + naoh -> h2o + nal

Elements would be the right answer

The main types of electromagnetic radiation. radio  waves have  the lowest frequencies  and  longest  wavelengths, while gamma  waves have highest frequencies  and shortest wavelengths. the wavelengths vary across the electromagnetic spectrum from about 10–15 m to more than 104 m.hope it !