Chemistry Crossword
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
                                            
 
 
Down: 1) -12) Light, Heat, Radio Waves,6) electron7) Atoms with the same atomic number but different mass numbers 8) 4,211) Discovered a neutral beam that had high penetrating power 12) Discovered the radioactive element polonium13) Suggested that alpha particles may rebound at an angle approaching 180 degrees after coming close to a nucleus. 15) Developed the cathode ray tube17) an unreacted element Across: 1) is credited with the discovery of radioactivity3) Measured the charge of an electron4) Gamma Rays, X Rays5) was first to identify the neutron 9) Used metallic foil as a target for alpha bombardment10) Proposed first atomic model that accounted for the electrical nature of the atom 14) balanced when the sum of the atomic numbers is equal on both sides of the equation 16) Electron18) Proposed that an atom was a sphere that was equally dense throughout19) neutral
 

 

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