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12 Cards in this Set
- Front
- Back
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matter |
anything that has mass and takes up space |
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element |
simplest pure substances that cannot be broken down into any other substance |
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compound |
a pure substance made of two or more elements that are combined chemically in a specific ratio |
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mixture |
two or more sustances (elements, compunds, or both) that are in the same place but are not chemically combined
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atom |
smallest particle of an element
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scientific theory |
a well tested idea that explains and connects a wide range of observations |
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model |
physical, mental, visual, and other representations of an idea to help people understand what they cannot observe directly
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electrons |
negatively charged particles |
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nucleus |
positively charged region in the center of an atom |
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protons |
positively charged particle in the nucleus of an atom |
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energy level |
A regionaround the nucleus in which electrons of the same energy arelikely to be found |
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neutrons |
the particlewas electrically neutral |
