Air Quality Learning Set 2.5-2.7 Crossword
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
                                  
 
 
Down: 1) the process of burning2) particulate matter that is a product of combustion4) subatomic particle found outside the nucleus of atoms; negatively charged5) average number of total protons AND neutrons in an atom's nucleus6) solid particles that become airborne and can be inhaled by people7) water that falls to Earth's surface11) a big idea in science, often developed over time using data16) an attraction between atoms that share electrons18) center part of an atom Across: 3) bond where 2 atoms share 4 electrons (2 gray rods)8) bond where 2 atoms share 2 electrons (1 gray rod)9) idea that all matter is formed from atoms10) particles that make up an atom12) number of protons in an atom's nucleus13) one group of elements found in the periodic table that have similar properties14) bond where 2 atoms share 6 electrons (3 gray rods)15) another term for chemical change17) a change in the form or appearance of matter, but not in its composition19) a change in the composition or chemical makeup of matter20) subatomic particle found in the nucleus of atoms; neutral charge21) subatomic particle found in the nucleus of atoms; positively charged22) water vapor in air
 

 

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