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1 
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Atoms gain or lose electron to attain the electron configuration of a noble gas 
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2 
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Based on particle size 
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3 
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Two or more different elements  
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4 
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Anything that has mass and takes up space 
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5 
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Electrons enter orbitals of lower energy 
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6 
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An orbital can only contain 2 electrons 
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8 
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Electrons in the highest occupied energy level of an elements atom 
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10 
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Positive ions 
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11 
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An attraction between atoms 
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13 
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Charged atoms 
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16 
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Negative ions 
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21 
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Simplest form of matter 
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24 
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Transfer of electrons between atoms to form ions that attract one another 
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25 
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Atoms of the same element that have different number of nuetrons 
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26 
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Matter made of only one kind of particle 
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27 
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Electrons fill orbitals one at a time, then double ups 
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28 
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Element with properties of both metals and nonmetals 
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30 
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Based on solubility 
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31 
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Based on boiling point 
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