Quiz 18.1 Crossword
             
             
             
             
             
             
             
             
             
             
             
             
 
 
Down: 1) Tiny particles that make up matter2) It is the number of protons in an atom.5) Particles that have a negative electric charge.6) Atoms of the same element that have a different number of neutrons. Across: 3) Particles that have a positive electric charge. They are part of the nucleus.4) Anything that has mass and takes up space7) The number of protons plus the number of neutrons in an atom.8) Particles that have no electric charge and are part of the nucleus.9) Substances that are made of only one type of atom and cannot be broken down into simpler substances by normal chemical or physical means.
 

 

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