What measures the number of protons and neutrons in an atom? -Atomic Number
-Atomic Mass
-Isotopes
-Olons

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.