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periodic table

1
  2     3
  4  
5                 6              
     
7       8            
    9        
10      
  11     12   13
14                     15  
  16                              
17                      
           
           
18              
19 20     21    
22                            
          23    
    24                                    
               
           
    25     26        
  27      
         
       
28 29            
  30          

Across
2.the smallest particlethat has theproperties of an element
5.an element that has properties of both a metal and a nonmetal
6.any atoms having the same number of protons but a diffrent number of nuetrons
7.the process of adding electrons to or removing electrons from an atom or a group of atoms
9.an ion with a negative charge
14.the center of am atom made up of protons and nuetrons
16.an electron in the outer most energy level of an atom
17.another name for period
18.an atom or a group of atoms that has lost or gained one or more electrons and therefore has a net electric charge
22.any ofthe possible energies an electron may have in an atom
24.the weighted average of the masses of all naturally occuring isotopes of an elementmetal
25.a negativley charged subatomic particle found in the nucleus of an atom
28.another namefor group
30.a postivley charged subatomic particle in the nucleus of an atom
Down
1.group2 or 2A
3.the total number of protons and nuetrons in the nucleus an atom
4.group 1 or 1A
8.symbol for atomic number
10.symbol for atomic mass unit
11.law of the periodic table
12.a neutral subatomic particle in the nucleus of an atom
13.a quonity equal to one twelth the mass of a carbon 12 atom
15.the nuber of protons in the nucleus of an atom
19.a horizontal row of elements in the peridic table
20.a region in an atom where there is a high probability of finding electrons
21.elements are good cundutors of heat and electricity
23.the elements that are usually poor conductors ofheat and electricity
26.an atom with a postive charge
27.a vertical column of elements in the periodic table
29.symbol for mass nuber

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