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science

sharameon warren

1
2                         3
   
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7                             8  
       
        9
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11       12                        
           
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    14                              
           
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  16            
17                      
     
18                     19          
   

Across
2.is the smaller of the two numbers in an element box- is a whole number
4.A fundamental substance that has a unique atomic number on the periodic table
5.Elements in the same vertical column of the periodic table; also called a group
7.an electron that is in the hightest occupied energy level of an atom
11.is the number found at the top of each column of elements
13.A chart of the elements showing the repeating pattern of their properties
14.one twelfth the mass of a carbon-12 atom
15.elements that have characteristics of metals and nonmetals
16.one of two or more atoms with the same atomic number but with different numbers of neutrons
17.is the total of the protons and neutrons in an atom
18.one of the elements of group 18 of the periodic table(helium, neon,argon, krypton, xenon, and radon); noble gases are unreactive
19.a horizontal row of elements in the periodic table
Down
1.elements that form a bridge between the elements on the left and right sides of the table
3.caused when element lose electrons
6.located on the left side of the stair step line
8.caused when element gain electrons
9.located on the right side of the stair step line
10.A molecule containing two or more different atoms bound together.
12.tells how many shells are needed to place the electrons for an element
17.The smallest unit of matter that can exist of an element.

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