In which main energy level does the 's' sublevel first appear? k (first main energy level) l (second main energy level) m (third main energy level) n (fourth main energy level)

Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

Acontrol during an experiment. might change remains constant does not exist does change