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vocab

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
matter   anything that mass and takes up space  
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mixture   matter that can vary in composition  
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molecule   two or more atoms that are held together by a chemical bond and act as a unit  
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substance   matter with a composition that is always the same  
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atom   a small particle that is the building block matter  
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element   a substance made of two or more elements that are chemically joined in a specific combination  
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heterogeneous   mixture in which the substances are not evenly mixed  
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homogeneous   mixture in which two or more substances are evenly mixed but not boned together  
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atomic number   the number of protons in the nucleus of an atom of an element  
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electron   a negatively charged particle that occupies the space in an atom out side the nucleus  
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electron cloud   the region surrounding an atoms nucleus where one or more electrons are most likely to be found  
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ion   an atom that has a charge because it has gained or lost electrons  
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isotope   one of two or more atoms of an element having the same number of protons but a different number of neutrons  
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neutron   an uncharged particle in the nucleus of an atom  
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nucleus   the region at the center of an atom that contains most mass of the atom  
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proton   a positively charged particle in the nucleus of an atom  
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