Classify each statement as an observation, a law, or a theory.
a) Chlorine is a highly reactive gas.
b) If elements are listed in order of increasing mass of their atoms, their chemical reactivity follows a repeating pattern.
c) Neon is an inert (or nonreactive) gas.
d) The reactivity of elements depends on the arrangement of their electrons.
We’re being asked to classify each statement as an observation, a law, or a theory. But first, let’s see what is the difference between an observation, a law, and a theory.
▪ what you see or observe what is physically happening through measurements in terms of an experiment
▪ based on observation
▪ states what’s occurring or predict what’s going to happen through observations