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| Decontamination of polluted environments using chemical and biological knowledge |
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| A pure substance that cannot be broken down into simpler substances by ordinary chemical or physical techniques |
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| Anything that occupies space and has mass |
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| The smallest units that retain the chemical and physical properties of an element |
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Definition
| Atoms combined chemically in fixed numbers and ratios |
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Definition
| Molecules whose component atoms are different |
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| Fast moving particles called around a atomic nucleus |
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| Positively charged particles in the atomic nuclei |
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| Number of protons in nucleus |
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| Uncharged particles in a nuclei |
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| Distinct forms of the atoms that all have the same number of protons but different number of neutrons |
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| Number of protons plus neutrons |
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| Particles and energy given off by an unstable isotope |
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| Unstable radioactive isotope |
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| The region of space where the electron "lives" most of the time |
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