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Atoms

MrH

Review structure of atom

1           2   3
   
4                
   
5              
 
6       7
   
8     9          
   
10       11 12    
    13           14
15              
    16         17      
       
18            
  19        
 

Across
1.Element with atomic number of 1
4.These atoms have the same atomic number and different atomic masses
5.The number of these is different for different isotopes of the same element
6.Hydrogen has this many electrons in the second energy level
8.Element with atomic number of 12
10.Helium has both its electrons in this energy level
13.The center of the atom
15.Total number of electrons for Lithium
16.Number of protons in every atom of Aluminum
18.Lithium has one electron in this energy level
19.Sodium (Na) has one electron in this energy level
Down
2.They have much less mass than protons or neutrons
3.This element has 18 protons
7.Number of neutrons in an isotope of Mg with atomic mass of 26
9.This element has the first and second energy levels of electrons filled
11.Number of neutrons in Aluminum isotope with atomic mass of 25
12.The number of these equals the atomic number
14.Oxygen has this many electrons in the second energy level
15.Number of electrons which can fit in the first energy level
17.Number of electrons which can fit in the second energy level

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