Atomic and Molecular Structure
C.1. The periodic table displays the elements in increasing atomic number and shows how periodicity of the physical and chemical properties of the elements relates to atomic structure. As a basis for understanding this concept:
C.1.e. Students know the nucleus of the atom is much smaller than the atom yet contains most of its mass.
C.11. Nuclear processes are those in which an atomic nucleus changes, including radioactive decay of naturally occurring and human-made isotopes, nuclear fission, and nuclear fusion. As a basis for understanding this concept:
C.11.c. Students know some naturally occurring isotopes of elements are radioactive, as are isotopes formed in nuclear reactions.