Quiz 18.1 Crossword
            
            
            
            
            
            
            
            
            
            
            
 
 
Down: 1) Particles that have a positive electric charge. They are part of the nucleus.3) The number of protons plus the number of neutrons in an atom.4) Particles that have no electric charge and are part of the nucleus.6) Substances that are made of only one type of atom and cannot be broken down into simpler substances by normal chemical or physical means.7) Anything that has mass and takes up space Across: 2) Tiny particles that make up matter5) Atoms of the same element that have a different number of neutrons.8) It is the number of protons in an atom.9) Particles that have a negative electric charge.
 

 

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