This printable word search puzzle contains 18 hidden words in a 24x24 letter grid. Words go horizontally, vertically, backwards, and diagonally. This word search is also available to download as a Microsoft Word document or a PDF.
Endothermic
Combustion
Exothermic
Compound
Electron
Hydrogen
Molecule
Reaction
Element
Isotope
Neutron
Nucleus
Valence
Oxygen
Proton
Metal
Atom
Ion