Stability of an isotope is based on the ratio of neutrons and protons in its nucleus. Although most nuclei are stable, some are unstable and spontaneously decay, emitting radiation.
Students will understand and apply scientific concepts, principles, and theories pertaining to the physical setting and living environment and recognize the historical development of ideas in science.
Matter is made up of particles whose properties determine the observable characteristics of matter and its reactivity.
Explain the properties of materials in terms of the arrangement and properties of the atoms that compose them.