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2
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A representation of something.
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4
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The center of an atom.
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8
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Something that shows all the elements arranged by atomis number.
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10
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A well tested explanation of something that occurs.
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11
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The unknown in an experiment you change to see if it effects the outcome.
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12
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Asking for information. Conducting an experiment to find the answer.
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13
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Pieces that were designed to perform a specific function.
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15
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A substance made up of only one kind of atom.
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16
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The smallest part of an element.
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17
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A prediction that can be tested.
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18
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A substance that conducts heat and electricity.
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19
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What you think will happen in the future.
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