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1
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this element has no neutrons!
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2
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this element has 27 electrons
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3
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every element has its own unique number of these
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6
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what scientists used to organize the elements
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9
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this is the unit we use to describe mass in atoms
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10
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this element has 2 protons
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12
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this 1 or 2 letter word combo tells you what the element is
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14
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these are neutral and found in the nucleus
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15
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different atoms belong to different ____________
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18
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made up of protons, neutrons and electrons
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19
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this element has an atomic mass of about 127amu
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