a. subject to change if new information is discovered.
b.a solution the problem of differing isotopes.
c. unchangeale. <----
d. a descriptive table that lists all of the elements
Actually, the correct answer is a. Atomic theory is subject to change if new information is discovered. Atomic theory is the scientific explanation that describes the structure, behavior, and properties of atoms, which are the building blocks of matter. It is based on the observations and experiments conducted by scientists over many years to understand how atoms behave. However, as scientific knowledge advances and new evidence emerges, the atomic theory may be revised or expanded to accommodate new information. This flexibility allows scientists to continually refine their understanding of atoms and the principles that govern them. So, atomic theory is not unchangeable (answer c), but rather adaptable and open to revision when necessary.
