This printable crossword puzzle on the topic of Physics has 10 clues. Answers range from 5 to 18 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.
A schematic description of a system
The center of an atom
The number of protons in an atom
The sum of neutrons and protons in an atom
Atoms with the same number of protons
A collection of atoms that have the same number of protons
An atom with an unstable nucleus
The time it takes for a radioactive isotope to decay
A high energy photon
Holds quarks together while it exchanges