Describe the basic patterns in the Periodic Table related to: Atomic number
valence electrons
valence shells
chemical properties/reactivity

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

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