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| Measure of amount of material in an object or substance. |
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| measure of the force of gravity acting on an object or substance. |
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| amount of space taken up by an object or substance |
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| a substance that can not be broken up in to simpler substances by ordinary chemical means. Made up of atoms |
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| composed of negetivly charged particles moving at high speed around a central nucleus |
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| negetivly charged particle |
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| positivly charged center of the atom |
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| make up the inside of th nucleus and are positivly charged particles |
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| no charge and make up the nucleus |
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| mesons hold the neutrons and protons together to form the nucleus |
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| small particles that make up the protons and neutrons called up down strange charm top bottom. |
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| hold together quarks. they are particles |
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| anything with mass and volume |
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| the concept that each element is made up of tiny particles. all alike called atoms |
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| the number of protons in the nucleus |
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| atoms of an element that have different masses |
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| sum of protons and neutrons in an isotope |
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| isotope/atomic #1 mass #2 |
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