Group the labels according to the arrangement of elements they

describe.

Asimply means that over time there was some sort of change.

Examine the equation. 23490th→23088ra+42he what kind of barrier would you need to block the radioactive particles from this reaction? a. a piece of paper b. a sheet of aluminum foil c. a two-inch block of lead d. a solid concrete block

What occurs during a combustion reaction