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Matter and the Periodic Table

1 2
   
   
3               4      
     
5         6  
  7 8              
       
9                            
       
10                 11              
       
12        
  13                              
         
    14              
       
  15                                
16                
  17    
18                                    
     

Across
3.average mass of an element
5.smallest part of an element
8.has mass and takes up space
9.outermost shell of an atom
10.a pure substance made from two or more elements
11.negative charge
13.one kind of matter
14.positive charge
15.a property that describes the abiity of a substance to change into a new substance
16.cannot be broken down
18.a mixture that looks the same throughout
Down
1.neutral charge
2.different parts of the mixture are visible
4.number of protons in an atom of an element
6.a property that describes the physical appearance and composition
7.electrons in the valence shell
12.a combination of pure substances
17.an atom or group of atoms with a negative or positive charge

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