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Distinguish between atoms and molecules

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.

atom   the smallest unit of an element that maintains the properties of that element.  
element   a substance that cannot be separated or broken down into simpler substances by chemical means.  
nucleus   in physical science, an atom's central region, which is made up of protons and neutrons.  
proton   a subatomic particle that has a positive charge and that is found in the nucleus of an atom.  
neutron   a subatomic particle that as no charge and that is found in the nucleus of an atom.  
electron   a subatomic particle that has a negative charge.  
atomic number   the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element.  
neutral   having no overall charge.  
atomic mass   the mass of an atom expressed in atomic mass unit.  
chemical symbol   a one- or two-letter code that represents an element.  


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